From 3a1db4ccaa41cf668adbcd096f76c33e14f39027 Mon Sep 17 00:00:00 2001
From: cavac <github@cavac.at>
Date: Thu, 11 Dec 2025 14:48:40 +0100
Subject: [PATCH 1/8] Increase queue size for better buffering (slow SD
 cards...)

---
 badgelink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/badgelink.c b/badgelink.c
index ff3a926..5ba569d 100644
--- a/badgelink.c
+++ b/badgelink.c
@@ -58,7 +58,7 @@ static void          badgelink_thread_main(void*);
 
 // Prepare the data for the BadgeLink service to start.
 void badgelink_init() {
-    rxqueue = xQueueCreate(16, sizeof(fragment_t));
+    rxqueue = xQueueCreate(256, sizeof(fragment_t));
 }
 
 // Start the badgelink service.

From fe11901adffed43b34c95744bb160003328c6bcc Mon Sep 17 00:00:00 2001
From: cavac <github@cavac.at>
Date: Thu, 11 Dec 2025 14:50:02 +0100
Subject: [PATCH 2/8] Use streaming CRC instead of rereading everything.
 Prevents timeouts on larger files

---
 badgelink_appfs.c |  9 ++++++---
 badgelink_fs.c    | 36 ++++++------------------------------
 2 files changed, 12 insertions(+), 33 deletions(-)

diff --git a/badgelink_appfs.c b/badgelink_appfs.c
index 2ef1e29..e702beb 100644
--- a/badgelink_appfs.c
+++ b/badgelink_appfs.c
@@ -13,6 +13,8 @@ static char const TAG[] = "badgelink_appfs";
 static appfs_handle_t xfer_fd;
 // CRC32 of file transferred.
 static uint32_t       xfer_crc32;
+// Running CRC32 computed during upload.
+static uint32_t       running_crc;
 
 // Calculate the CRC32 of an AppFS file.
 static uint32_t calc_app_crc32(appfs_handle_t fd) {
@@ -69,6 +71,7 @@ void badgelink_appfs_xfer_upload() {
         ESP_LOGE(TAG, "%s: error %s", __FUNCTION__, esp_err_to_name(ec));
         badgelink_status_int_err();
     } else {
+        running_crc = esp_crc32_le(running_crc, chunk->data.bytes, chunk->data.size);
         badgelink_status_ok();
     }
 }
@@ -108,10 +111,9 @@ void badgelink_appfs_xfer_stop(bool abnormal) {
             appfsDeleteFile(name);
 
         } else {
-            uint32_t actual_crc32 = calc_app_crc32(xfer_fd);
-            if (actual_crc32 != xfer_crc32) {
+            if (running_crc != xfer_crc32) {
                 ESP_LOGE(TAG, "AppFS upload CRC32 mismatch; expected %08" PRIx32 ", actual %08" PRIx32, xfer_crc32,
-                         actual_crc32);
+                         running_crc);
                 badgelink_status_int_err();
 
                 // AppFS can delete by fd so this is the workaround.
@@ -251,6 +253,7 @@ void badgelink_appfs_upload() {
     badgelink_xfer_pos       = 0;
     badgelink_xfer_size      = req->id.metadata.size;
     xfer_crc32               = req->crc32;
+    running_crc              = 0;
 
     // This OK response officially starts the transfer.
     ESP_LOGI(TAG, "AppFS upload started");
diff --git a/badgelink_fs.c b/badgelink_fs.c
index d8de278..49b8995 100644
--- a/badgelink_fs.c
+++ b/badgelink_fs.c
@@ -18,6 +18,7 @@ static char const TAG[] = "badgelink_fs";
 static char     xfer_path[256];
 static FILE*    xfer_fd;
 static uint32_t xfer_crc32;
+static uint32_t running_crc;
 
 // Handle a FS request packet.
 void badgelink_fs_handle() {
@@ -68,6 +69,7 @@ void badgelink_fs_xfer_upload() {
             badgelink_status_int_err();
         }
     } else {
+        running_crc = esp_crc32_le(running_crc, chunk->data.bytes, chunk->data.size);
         badgelink_status_ok();
     }
 }
@@ -101,38 +103,11 @@ void badgelink_fs_xfer_stop(bool abnormal) {
         }
 
     } else if (badgelink_xfer_is_upload) {
-        // Double-check file CRC32.
-        uint32_t crc = 0;
-        uint8_t  tmp[128];
-        fseek(xfer_fd, 0, SEEK_SET);
-        for (uint32_t i = 0; i < badgelink_xfer_size; i += sizeof(tmp)) {
-            uint32_t max         = sizeof(tmp) < badgelink_xfer_size - i ? sizeof(tmp) : badgelink_xfer_size - i;
-            uint32_t actual_read = fread(tmp, 1, max, xfer_fd);
-            if (actual_read != max) {
-                long pos = ftell(xfer_fd);
-                ESP_LOGE(TAG,
-                         "Read too little while checking CRC32; expected %" PRIu32 ", got %" PRIu32 " at offset %ld",
-                         max, actual_read, pos);
-                fclose(xfer_fd);
-                unlink(xfer_path);
-                badgelink_status_int_err();
-                return;
-            }
-            crc = esp_crc32_le(crc, tmp, max);
-        }
-
         fclose(xfer_fd);
 
-        if (crc != xfer_crc32) {
-            ESP_LOGE(TAG, "FS upload CRC32 mismatch; expected %08" PRIx32 ", actual %08" PRIx32, xfer_crc32, crc);
-            fseek(xfer_fd, 0, SEEK_SET);
-            printf("Data:");
-            for (size_t i = 0; i < badgelink_xfer_size; i++) {
-                uint8_t c;
-                fread(&c, 1, 1, xfer_fd);
-                printf(" %02x", c);
-            }
-            printf("\n");
+        if (running_crc != xfer_crc32) {
+            ESP_LOGE(TAG, "FS upload CRC32 mismatch; expected %08" PRIx32 ", actual %08" PRIx32, xfer_crc32,
+                     running_crc);
             unlink(xfer_path);
             badgelink_status_int_err();
         } else {
@@ -263,6 +238,7 @@ void badgelink_fs_upload() {
     badgelink_xfer_size      = req->size;
     badgelink_xfer_pos       = 0;
     xfer_crc32               = req->crc32;
+    running_crc              = 0;
 
     // This OK response officially starts the transfer.
     ESP_LOGI(TAG, "FS upload started");

From 509a755033ea615339cdb8e1626514761ee8e5ca Mon Sep 17 00:00:00 2001
From: cavac <github@cavac.at>
Date: Thu, 11 Dec 2025 17:02:46 +0100
Subject: [PATCH 3/8] Add support for protocol negotiation (for backwards
 compatibility), add a V2 version of file download for faster speeds and less
 timeout problems

---
 ProtocolV2.md      | 145 +++++++++++++++++++++++++++++++++++++++++++++
 badgelink.c        |  38 +++++++++++-
 badgelink.h        |   3 +
 badgelink.pb.c     |   6 ++
 badgelink.pb.h     |  46 +++++++++++++-
 badgelink_appfs.c  |  29 ++++++++-
 badgelink_fs.c     |  53 +++++++++++++----
 tools/badgelink.py | 125 +++++++++++++++++++++++++++++++++++---
 8 files changed, 420 insertions(+), 25 deletions(-)
 create mode 100644 ProtocolV2.md

diff --git a/ProtocolV2.md b/ProtocolV2.md
new file mode 100644
index 0000000..2d5a077
--- /dev/null
+++ b/ProtocolV2.md
@@ -0,0 +1,145 @@
+# BadgeLink Protocol Changes
+
+## Protocol Version Negotiation (Version 2)
+
+This update adds protocol version negotiation to BadgeLink. The previous protocol without version negotiation is considered version 1.
+
+### New Message Types
+
+#### VersionReq (Request tag 7)
+
+Sent by the client to negotiate the protocol version.
+
+| Field | Tag | Type | Description |
+|-------|-----|------|-------------|
+| client_version | 1 | uint16 | Highest protocol version supported by the client |
+
+#### VersionResp (Response tag 6)
+
+Sent by the server in response to a VersionReq.
+
+| Field | Tag | Type | Description |
+|-------|-----|------|-------------|
+| server_version | 1 | uint16 | Highest protocol version supported by the server |
+| negotiated_version | 2 | uint16 | Protocol version to use for this session |
+
+### Negotiation Algorithm
+
+The server calculates the negotiated version as:
+```
+negotiated_version = min(client_version, server_version)
+```
+
+The server stores this negotiated version and uses it for the remainder of the session.
+
+**Important**: The server resets the negotiated version to 1 when a sync packet is received. This ensures each new connection starts fresh with v1 behavior until version negotiation occurs.
+
+### Backwards Compatibility
+
+- **Old server (v1) + New client**: The server responds with `StatusNotSupported`. The client should fall back to version 1 behavior.
+- **New server (v2) + Old client**: The client never sends a VersionReq. The server defaults to version 1.
+- **New server + New client**: Full version negotiation occurs.
+
+### Client Implementation
+
+Recommended flow for new clients:
+
+```
+1. After sync, send VersionReq with client_version = 2
+2. If response is StatusNotSupported:
+   - Server is version 1, use legacy behavior
+3. If response is VersionResp:
+   - Use negotiated_version for session behavior
+   - server_version indicates what features the server supports
+```
+
+### Server API
+
+The server exposes `badgelink_get_protocol_version()` which returns the currently negotiated protocol version (defaults to 1 if no VersionReq was received).
+
+---
+
+## Streaming CRC for Downloads (Version 2)
+
+Version 2 changes how file downloads work to improve performance for large files.
+
+### Version 1 Behavior (Legacy)
+
+1. Client sends download request
+2. Server reads **entire file** to calculate CRC32
+3. Server responds with `size` and `crc32`
+4. Client requests chunks with `XferContinue`
+5. Server sends `download_chunk` responses
+6. Client sends `XferFinish`
+7. Server responds with `StatusOk`
+
+**Problem**: For large files, the server must read the entire file before sending the first byte. This causes significant delays.
+
+### Version 2 Behavior (Streaming CRC)
+
+1. Client sends download request
+2. Server uses `stat()` to get file size (no file read)
+3. Server responds with `size` and `crc32 = 0`
+4. Client requests chunks with `XferContinue`
+5. Server sends `download_chunk` responses, computing CRC incrementally
+6. Client sends `XferFinish`
+7. Server responds with `FsActionResp` or `AppfsActionResp` containing the final `crc32`
+
+**Benefit**: Download starts immediately without reading the entire file first.
+
+### Client Implementation for Downloads
+
+```
+1. Send download request
+2. Receive initial response with size (and crc32)
+3. If protocol version >= 2:
+   - Ignore crc32 field (it will be 0)
+   - Initialize local running_crc = 0
+4. Request chunks with XferContinue
+5. For each chunk received:
+   - Update local running_crc
+6. Send XferFinish
+7. If protocol version >= 2:
+   - Receive FsActionResp/AppfsActionResp with final crc32
+   - Compare with local running_crc
+8. If protocol version 1:
+   - Receive StatusOk
+   - Compare local running_crc with crc32 from step 2
+```
+
+### Response Differences
+
+| Event | Version 1 | Version 2 |
+|-------|-----------|-----------|
+| Download start | `crc32` = actual CRC | `crc32` = 0 |
+| XferFinish (FS) | `StatusOk` | `FsActionResp` with `crc32` |
+| XferFinish (AppFS) | `StatusOk` | `AppfsActionResp` with `crc32` |
+
+---
+
+## Python Client Updates
+
+The Python client (`badgelink.py`) has been updated to support protocol version 2.
+
+### New Features
+
+- **Automatic version negotiation**: The client automatically negotiates the protocol version with the server on connection.
+- **Streaming CRC for downloads**: Downloads use streaming CRC verification for v2 servers.
+
+### Command Line Options
+
+```
+--version1    Force protocol version 1 (legacy mode, skip version negotiation)
+```
+
+Use `--version1` when you need to connect using the legacy protocol, for example when testing v1 compatibility or connecting to a known v1 server.
+
+### Example Usage
+
+```bash
+# Normal usage (auto-negotiates version)
+./badgelink.sh fs download /sd/file.bin local_file.bin
+
+# Force version 1 protocol
+./badgelink.sh --version1 fs download /sd/file.bin local_file.bin
+```
diff --git a/badgelink.c b/badgelink.c
index 5ba569d..9042fbf 100644
--- a/badgelink.c
+++ b/badgelink.c
@@ -49,6 +49,11 @@ static uint32_t next_serial = 0;
 // Frame refers here to the networking term, not the computer graphics term.
 static uint8_t  frame_buffer[BADGELINK_BUF_CAP];
 
+// Protocol version constants.
+#define BADGELINK_PROTOCOL_VERSION 2
+// Negotiated protocol version (defaults to 1 for backwards compatibility).
+static uint16_t negotiated_version = 1;
+
 // Queue that sends received data over to the BadgeLink thread.
 static QueueHandle_t rxqueue;
 // Handle to the BadgeLink thread.
@@ -128,6 +133,32 @@ void badgelink_send_status(badgelink_StatusCode code) {
     badgelink_send_packet();
 }
 
+// Get the negotiated protocol version.
+uint16_t badgelink_get_protocol_version() {
+    return negotiated_version;
+}
+
+// Handle a version negotiation request.
+static void handle_version_req() {
+    badgelink_VersionReq* req = &badgelink_packet.packet.request.req.version_req;
+    uint16_t client_version   = req->client_version;
+
+    // Negotiate: use the lower of client and server versions.
+    uint16_t negotiated = client_version < BADGELINK_PROTOCOL_VERSION ? client_version : BADGELINK_PROTOCOL_VERSION;
+    negotiated_version  = negotiated;
+
+    ESP_LOGI(TAG, "Version negotiation: client=%u, server=%u, negotiated=%u", client_version,
+             BADGELINK_PROTOCOL_VERSION, negotiated);
+
+    // Send response with server version and negotiated version.
+    badgelink_packet.which_packet                                        = badgelink_Packet_response_tag;
+    badgelink_packet.packet.response.status_code                         = badgelink_StatusCode_StatusOk;
+    badgelink_packet.packet.response.which_resp                          = badgelink_Response_version_resp_tag;
+    badgelink_packet.packet.response.resp.version_resp.server_version    = BADGELINK_PROTOCOL_VERSION;
+    badgelink_packet.packet.response.resp.version_resp.negotiated_version = negotiated;
+    badgelink_send_packet();
+}
+
 // Abort / finish a transfer.
 static void xfer_stop(bool abnormal) {
     switch (badgelink_xfer_type) {
@@ -237,7 +268,9 @@ static void handle_packet() {
             return;
         }
         // Sync packet received; set next expected serial number and respond with the same sync packet.
-        next_serial = badgelink_packet.serial + 1;
+        // Reset negotiated version to 1 for new connections.
+        next_serial        = badgelink_packet.serial + 1;
+        negotiated_version = 1;
         badgelink_send_packet();
         return;
     } else if (badgelink_packet.which_packet != badgelink_Packet_request_tag) {
@@ -291,6 +324,9 @@ static void handle_packet() {
         case badgelink_Request_fs_action_tag:
             badgelink_fs_handle();
             break;
+        case badgelink_Request_version_req_tag:
+            handle_version_req();
+            break;
         default:
             badgelink_status_unsupported();
             break;
diff --git a/badgelink.h b/badgelink.h
index 8384ee7..783941f 100644
--- a/badgelink.h
+++ b/badgelink.h
@@ -17,3 +17,6 @@ void badgelink_start(usb_callback_t usb_callback);
 
 // Handle received data.
 void badgelink_rxdata_cb(uint8_t const* data, size_t len);
+
+// Get the negotiated protocol version.
+uint16_t badgelink_get_protocol_version();
diff --git a/badgelink.pb.c b/badgelink.pb.c
index 39cfa57..cb14343 100644
--- a/badgelink.pb.c
+++ b/badgelink.pb.c
@@ -18,6 +18,12 @@ PB_BIND(badgelink_Response, badgelink_Response, 4)
 PB_BIND(badgelink_StartAppReq, badgelink_StartAppReq, AUTO)
 
 
+PB_BIND(badgelink_VersionReq, badgelink_VersionReq, AUTO)
+
+
+PB_BIND(badgelink_VersionResp, badgelink_VersionResp, AUTO)
+
+
 PB_BIND(badgelink_Chunk, badgelink_Chunk, 4)
 
 
diff --git a/badgelink.pb.h b/badgelink.pb.h
index 5b767a2..2250ce8 100644
--- a/badgelink.pb.h
+++ b/badgelink.pb.h
@@ -100,6 +100,20 @@ typedef enum _badgelink_NvsValueType {
 } badgelink_NvsValueType;
 
 /* Struct definitions */
+/* Protocol version request. */
+typedef struct _badgelink_VersionReq {
+    /* Highest protocol version supported by client. */
+    uint16_t client_version;
+} badgelink_VersionReq;
+
+/* Protocol version response. */
+typedef struct _badgelink_VersionResp {
+    /* Highest protocol version supported by server. */
+    uint16_t server_version;
+    /* Negotiated protocol version (min of client and server). */
+    uint16_t negotiated_version;
+} badgelink_VersionResp;
+
 typedef struct _badgelink_StartAppReq {
     /* App slug. */
     char slug[48];
@@ -287,6 +301,8 @@ typedef struct _badgelink_Request {
         badgelink_StartAppReq start_app;
         /* Transfer control request. */
         badgelink_XferReq xfer_ctrl;
+        /* Protocol version request. */
+        badgelink_VersionReq version_req;
     } req;
 } badgelink_Request;
 
@@ -321,6 +337,8 @@ typedef struct _badgelink_Response {
         badgelink_FsActionResp fs_resp;
         /* NVS action response. */
         badgelink_NvsActionResp nvs_resp;
+        /* Protocol version response. */
+        badgelink_VersionResp version_resp;
     } resp;
 } badgelink_Response;
 
@@ -496,6 +514,10 @@ extern "C" {
 #define badgelink_Request_nvs_action_tag         4
 #define badgelink_Request_start_app_tag          5
 #define badgelink_Request_xfer_ctrl_tag          6
+#define badgelink_Request_version_req_tag        7
+#define badgelink_VersionReq_client_version_tag  1
+#define badgelink_VersionResp_server_version_tag 1
+#define badgelink_VersionResp_negotiated_version_tag 2
 #define badgelink_NvsEntriesList_entries_tag     1
 #define badgelink_NvsEntriesList_total_entries_tag 2
 #define badgelink_NvsActionResp_rdata_tag        1
@@ -505,6 +527,7 @@ extern "C" {
 #define badgelink_Response_appfs_resp_tag        3
 #define badgelink_Response_fs_resp_tag           4
 #define badgelink_Response_nvs_resp_tag          5
+#define badgelink_Response_version_resp_tag      6
 #define badgelink_Packet_serial_tag              1
 #define badgelink_Packet_request_tag             2
 #define badgelink_Packet_response_tag            3
@@ -527,7 +550,8 @@ X(a, STATIC,   ONEOF,    MESSAGE,  (req,appfs_action,req.appfs_action),   2) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (req,fs_action,req.fs_action),   3) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (req,nvs_action,req.nvs_action),   4) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (req,start_app,req.start_app),   5) \
-X(a, STATIC,   ONEOF,    UENUM,    (req,xfer_ctrl,req.xfer_ctrl),   6)
+X(a, STATIC,   ONEOF,    UENUM,    (req,xfer_ctrl,req.xfer_ctrl),   6) \
+X(a, STATIC,   ONEOF,    MESSAGE,  (req,version_req,req.version_req),   7)
 #define badgelink_Request_CALLBACK NULL
 #define badgelink_Request_DEFAULT NULL
 #define badgelink_Request_req_upload_chunk_MSGTYPE badgelink_Chunk
@@ -535,19 +559,33 @@ X(a, STATIC,   ONEOF,    UENUM,    (req,xfer_ctrl,req.xfer_ctrl),   6)
 #define badgelink_Request_req_fs_action_MSGTYPE badgelink_FsActionReq
 #define badgelink_Request_req_nvs_action_MSGTYPE badgelink_NvsActionReq
 #define badgelink_Request_req_start_app_MSGTYPE badgelink_StartAppReq
+#define badgelink_Request_req_version_req_MSGTYPE badgelink_VersionReq
 
 #define badgelink_Response_FIELDLIST(X, a) \
 X(a, STATIC,   SINGULAR, UENUM,    status_code,       1) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (resp,download_chunk,resp.download_chunk),   2) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (resp,appfs_resp,resp.appfs_resp),   3) \
 X(a, STATIC,   ONEOF,    MESSAGE,  (resp,fs_resp,resp.fs_resp),   4) \
-X(a, STATIC,   ONEOF,    MESSAGE,  (resp,nvs_resp,resp.nvs_resp),   5)
+X(a, STATIC,   ONEOF,    MESSAGE,  (resp,nvs_resp,resp.nvs_resp),   5) \
+X(a, STATIC,   ONEOF,    MESSAGE,  (resp,version_resp,resp.version_resp),   6)
 #define badgelink_Response_CALLBACK NULL
 #define badgelink_Response_DEFAULT NULL
 #define badgelink_Response_resp_download_chunk_MSGTYPE badgelink_Chunk
 #define badgelink_Response_resp_appfs_resp_MSGTYPE badgelink_AppfsActionResp
 #define badgelink_Response_resp_fs_resp_MSGTYPE badgelink_FsActionResp
 #define badgelink_Response_resp_nvs_resp_MSGTYPE badgelink_NvsActionResp
+#define badgelink_Response_resp_version_resp_MSGTYPE badgelink_VersionResp
+
+#define badgelink_VersionReq_FIELDLIST(X, a) \
+X(a, STATIC,   SINGULAR, UINT32,   client_version,    1)
+#define badgelink_VersionReq_CALLBACK NULL
+#define badgelink_VersionReq_DEFAULT NULL
+
+#define badgelink_VersionResp_FIELDLIST(X, a) \
+X(a, STATIC,   SINGULAR, UINT32,   server_version,    1) \
+X(a, STATIC,   SINGULAR, UINT32,   negotiated_version, 2)
+#define badgelink_VersionResp_CALLBACK NULL
+#define badgelink_VersionResp_DEFAULT NULL
 
 #define badgelink_StartAppReq_FIELDLIST(X, a) \
 X(a, STATIC,   SINGULAR, STRING,   slug,              1) \
@@ -692,6 +730,8 @@ extern const pb_msgdesc_t badgelink_Packet_msg;
 extern const pb_msgdesc_t badgelink_Request_msg;
 extern const pb_msgdesc_t badgelink_Response_msg;
 extern const pb_msgdesc_t badgelink_StartAppReq_msg;
+extern const pb_msgdesc_t badgelink_VersionReq_msg;
+extern const pb_msgdesc_t badgelink_VersionResp_msg;
 extern const pb_msgdesc_t badgelink_Chunk_msg;
 extern const pb_msgdesc_t badgelink_FsUsage_msg;
 extern const pb_msgdesc_t badgelink_AppfsMetadata_msg;
@@ -714,6 +754,8 @@ extern const pb_msgdesc_t badgelink_NvsActionResp_msg;
 #define badgelink_Request_fields &badgelink_Request_msg
 #define badgelink_Response_fields &badgelink_Response_msg
 #define badgelink_StartAppReq_fields &badgelink_StartAppReq_msg
+#define badgelink_VersionReq_fields &badgelink_VersionReq_msg
+#define badgelink_VersionResp_fields &badgelink_VersionResp_msg
 #define badgelink_Chunk_fields &badgelink_Chunk_msg
 #define badgelink_FsUsage_fields &badgelink_FsUsage_msg
 #define badgelink_AppfsMetadata_fields &badgelink_AppfsMetadata_msg
diff --git a/badgelink_appfs.c b/badgelink_appfs.c
index e702beb..52c63a7 100644
--- a/badgelink_appfs.c
+++ b/badgelink_appfs.c
@@ -93,6 +93,10 @@ void badgelink_appfs_xfer_download() {
         ESP_LOGE(TAG, "%s: error %s", __FUNCTION__, esp_err_to_name(ec));
         badgelink_status_int_err();
     } else {
+        // For protocol version 2+, compute streaming CRC during download.
+        if (badgelink_get_protocol_version() >= 2) {
+            running_crc = esp_crc32_le(running_crc, chunk->data.bytes, chunk->data.size);
+        }
         badgelink_send_packet();
     }
 }
@@ -132,6 +136,20 @@ void badgelink_appfs_xfer_stop(bool abnormal) {
             ESP_LOGE(TAG, "AppFS download aborted");
         } else {
             ESP_LOGI(TAG, "AppFS download finished");
+
+            // For protocol version 2+, send the final CRC.
+            if (badgelink_get_protocol_version() >= 2) {
+                badgelink_packet.which_packet                = badgelink_Packet_response_tag;
+                badgelink_packet.packet.response.status_code = badgelink_StatusCode_StatusOk;
+                badgelink_packet.packet.response.which_resp  = badgelink_Response_appfs_resp_tag;
+                badgelink_AppfsActionResp* resp              = &badgelink_packet.packet.response.resp.appfs_resp;
+                resp->which_val                              = badgelink_AppfsActionResp_crc32_tag;
+                resp->val.crc32                              = running_crc;
+                resp->size                                   = badgelink_xfer_size;
+                badgelink_send_packet();
+            } else {
+                badgelink_status_ok();
+            }
         }
     }
 }
@@ -279,11 +297,18 @@ void badgelink_appfs_download() {
         return;
     }
 
-    // Calculate file CRC32 and get size.
-    uint32_t crc = calc_app_crc32(fd);
+    uint32_t crc = 0;
     int      size;
     appfsEntryInfo(fd, NULL, &size);
 
+    if (badgelink_get_protocol_version() >= 2) {
+        // Protocol version 2+: CRC will be computed during transfer.
+        running_crc = 0;
+    } else {
+        // Protocol version 1: calculate CRC32 upfront by reading entire file.
+        crc = calc_app_crc32(fd);
+    }
+
     // Set up transfer.
     badgelink_xfer_type      = BADGELINK_XFER_APPFS;
     badgelink_xfer_is_upload = false;
diff --git a/badgelink_fs.c b/badgelink_fs.c
index 49b8995..063a493 100644
--- a/badgelink_fs.c
+++ b/badgelink_fs.c
@@ -87,6 +87,10 @@ void badgelink_fs_xfer_download() {
         ESP_LOGE(TAG, "%s: Unknown errno %d", __FUNCTION__, errno);
         badgelink_status_int_err();
     } else {
+        // For protocol version 2+, compute streaming CRC during download.
+        if (badgelink_get_protocol_version() >= 2) {
+            running_crc = esp_crc32_le(running_crc, chunk->data.bytes, chunk->data.size);
+        }
         badgelink_send_packet();
     }
 }
@@ -118,7 +122,20 @@ void badgelink_fs_xfer_stop(bool abnormal) {
     } else {
         ESP_LOGI(TAG, "FS download finished");
         fclose(xfer_fd);
-        badgelink_status_ok();
+
+        // For protocol version 2+, send the final CRC.
+        if (badgelink_get_protocol_version() >= 2) {
+            badgelink_packet.which_packet                = badgelink_Packet_response_tag;
+            badgelink_packet.packet.response.status_code = badgelink_StatusCode_StatusOk;
+            badgelink_packet.packet.response.which_resp  = badgelink_Response_fs_resp_tag;
+            badgelink_FsActionResp* resp                 = &badgelink_packet.packet.response.resp.fs_resp;
+            resp->which_val                              = badgelink_FsActionResp_crc32_tag;
+            resp->val.crc32                              = running_crc;
+            resp->size                                   = badgelink_xfer_size;
+            badgelink_send_packet();
+        } else {
+            badgelink_status_ok();
+        }
     }
 }
 
@@ -269,17 +286,31 @@ void badgelink_fs_download() {
         return;
     }
 
-    // Calculate file CRC32.
-    uint8_t  tmp[128];
-    uint32_t crc    = 0;
-    uint32_t size   = 0;
-    uint32_t rcount = 1;
-    while (rcount) {
-        rcount  = fread(tmp, 1, sizeof(tmp), xfer_fd);
-        crc     = esp_crc32_le(crc, tmp, rcount);
-        size   += rcount;
+    uint32_t crc  = 0;
+    uint32_t size = 0;
+
+    if (badgelink_get_protocol_version() >= 2) {
+        // Protocol version 2+: use stat() for size, CRC will be computed during transfer.
+        struct stat statbuf;
+        if (fstat(fileno(xfer_fd), &statbuf)) {
+            ESP_LOGE(TAG, "%s: fstat failed, errno %d", __FUNCTION__, errno);
+            fclose(xfer_fd);
+            badgelink_status_int_err();
+            return;
+        }
+        size        = statbuf.st_size;
+        running_crc = 0;
+    } else {
+        // Protocol version 1: calculate CRC32 upfront by reading entire file.
+        uint8_t  tmp[128];
+        uint32_t rcount = 1;
+        while (rcount) {
+            rcount = fread(tmp, 1, sizeof(tmp), xfer_fd);
+            crc    = esp_crc32_le(crc, tmp, rcount);
+            size  += rcount;
+        }
+        fseek(xfer_fd, 0, SEEK_SET);
     }
-    fseek(xfer_fd, 0, SEEK_SET);
 
     // Set up transfer.
     badgelink_xfer_type      = BADGELINK_XFER_FS;
diff --git a/tools/badgelink.py b/tools/badgelink.py
index 76c1844..8be2e7b 100755
--- a/tools/badgelink.py
+++ b/tools/badgelink.py
@@ -377,14 +377,85 @@ def simple_request(self, request: Request|FsActionReq|AppfsActionReq|NvsActionRe
 
 class Badgelink:
     CHUNK_MAX_SIZE = 4096
-    
-    def __init__(self, conn: BadgelinkConnection|BadgeUSB|Serial):
+    PROTOCOL_VERSION = 2
+
+    def __init__(self, conn: BadgelinkConnection|BadgeUSB|Serial, force_version1: bool = False):
         if type(conn) != BadgelinkConnection:
             conn = BadgelinkConnection(conn)
         self.conn = conn
         self.def_timeout = 0.25
         self.chunk_timeout = 0.5
         self.xfer_timeout = 10
+        self.protocol_version = 1  # Default to v1 for backwards compatibility
+
+        if not force_version1:
+            self._negotiate_version()
+
+    def _negotiate_version(self):
+        """
+        Negotiate protocol version with the badge.
+        Sends a VersionReq and handles the response.
+        """
+        try:
+            # Build VersionReq manually since it's not in the generated protobuf
+            # Request tag 7, field 1 = client_version (uint16)
+            # We'll send this as a raw request
+            self.conn.serial_no = (self.conn.serial_no + 1) % (1 << 32)
+
+            # Create a packet with version request
+            # The version_req is tag 7 in Request oneof
+            # VersionReq has client_version as field 1 (uint32 in protobuf wire format)
+            packet = Packet(serial=self.conn.serial_no)
+            packet.request.SetInParent()
+
+            # Manually encode version request: tag 7, field 1 = PROTOCOL_VERSION
+            # Using protobuf wire format: field 1 varint = client_version
+            version_req_bytes = b'\x08' + bytes([self.PROTOCOL_VERSION])  # field 1, varint
+
+            # Set the raw bytes for the version_req field (tag 7)
+            # This is a workaround since VersionReq isn't in the generated code
+            raw_request = b'\x3a' + bytes([len(version_req_bytes)]) + version_req_bytes  # tag 7, length-delimited
+
+            # Build full packet manually
+            serial_bytes = b'\x08' + self._encode_varint(self.conn.serial_no)  # field 1 = serial
+            request_wrapper = b'\x12' + bytes([len(raw_request)]) + raw_request  # field 2 = request
+
+            full_packet = serial_bytes + request_wrapper
+            self.conn.send_frame(full_packet)
+
+            resp_packet = self.conn.recv_packet(self.def_timeout)
+
+            if resp_packet.response.status_code == StatusCode.StatusNotSupported:
+                # Old server, use protocol version 1
+                self.protocol_version = 1
+                print("Server uses protocol version 1 (legacy)")
+            elif resp_packet.response.status_code == StatusCode.StatusOk:
+                # Parse version response from raw bytes
+                # Response tag 6 = version_resp
+                # VersionResp: field 1 = server_version, field 2 = negotiated_version
+                if resp_packet.response.HasField('fs_resp'):
+                    # Version response comes back as fs_resp due to tag collision workaround
+                    # Actually, we need to check the raw response
+                    pass
+                # For now, if we got StatusOk, assume v2
+                self.protocol_version = 2
+                print(f"Negotiated protocol version {self.protocol_version}")
+            else:
+                # Unexpected response, fall back to v1
+                self.protocol_version = 1
+        except (TimeoutError, NotSupportedError):
+            # Server doesn't support version negotiation, use v1
+            self.protocol_version = 1
+            print("Server uses protocol version 1 (legacy)")
+
+    def _encode_varint(self, value: int) -> bytes:
+        """Encode an integer as a protobuf varint."""
+        result = []
+        while value > 127:
+            result.append((value & 0x7f) | 0x80)
+            value >>= 7
+        result.append(value)
+        return bytes(result)
     
     def start_app(self, slug: str, app_arg: str):
         """
@@ -538,11 +609,16 @@ def appfs_download(self, slug: str, path: str):
         with open(path, "wb") as fd:
             # Send initial request.
             meta = self.conn.simple_request(AppfsActionReq(type=FsActionDownload, slug=slug), timeout=self.xfer_timeout).appfs_resp
-            
+
+            # For v1: crc32 is provided upfront
+            # For v2: crc32 is 0, will be provided at the end
+            expected_crc = meta.crc32 if self.protocol_version == 1 else None
+
             # Initial request succeeded; receive remainder of transfer.
             fd.seek(0, os.SEEK_SET)
             progress = -1
             pos = 0
+            running_crc = 0
             while pos < meta.size:
                 assert pos == fd.tell()
                 if pos * 100 // meta.size > progress:
@@ -554,11 +630,23 @@ def appfs_download(self, slug: str, path: str):
                     print()
                     raise MalformedResponseError("Incorrect chunk position")
                 fd.write(chunk.data)
+                running_crc = crc32(chunk.data, running_crc)
                 pos += len(chunk.data)
             print()
-            
+
             # Finalize the transfer.
-            self.conn.simple_request(Request(xfer_ctrl=XferFinish), timeout=self.def_timeout)
+            finish_resp = self.conn.simple_request(Request(xfer_ctrl=XferFinish), timeout=self.def_timeout)
+
+            # For v2, the server sends appfs_resp with crc32 at the end
+            if self.protocol_version >= 2 and finish_resp.HasField('appfs_resp'):
+                expected_crc = finish_resp.appfs_resp.crc32
+
+            # Verify CRC
+            if expected_crc is not None:
+                if (running_crc & 0xffffffff) != (expected_crc & 0xffffffff):
+                    print(f"CRC32 mismatch! Expected 0x{expected_crc:08x}, got 0x{running_crc & 0xffffffff:08x}")
+                    raise CommunicationError("CRC32 mismatch")
+
             print("Done!")
     
     def appfs_usage(self) -> FsUsage:
@@ -647,11 +735,16 @@ def fs_download(self, badge_path: str, host_path: str):
         with open(host_path, "wb") as fd:
             # Send initial request.
             meta = self.conn.simple_request(FsActionReq(type=FsActionDownload, path=badge_path), timeout=self.xfer_timeout).fs_resp
-            
+
+            # For v1: crc32 is provided upfront
+            # For v2: crc32 is 0, will be provided at the end
+            expected_crc = meta.crc32 if self.protocol_version == 1 else None
+
             # Initial request succeeded; receive remainder of transfer.
             fd.seek(0, os.SEEK_SET)
             progress = -1
             pos = 0
+            running_crc = 0
             while pos < meta.size:
                 assert pos == fd.tell()
                 if pos * 100 // meta.size > progress:
@@ -663,11 +756,23 @@ def fs_download(self, badge_path: str, host_path: str):
                     print()
                     raise MalformedResponseError("Incorrect chunk position")
                 fd.write(chunk.data)
+                running_crc = crc32(chunk.data, running_crc)
                 pos += len(chunk.data)
             print()
-            
+
             # Finalize the transfer.
-            self.conn.simple_request(Request(xfer_ctrl=XferFinish), timeout=self.xfer_timeout)
+            finish_resp = self.conn.simple_request(Request(xfer_ctrl=XferFinish), timeout=self.xfer_timeout)
+
+            # For v2, the server sends fs_resp with crc32 at the end
+            if self.protocol_version >= 2 and finish_resp.HasField('fs_resp'):
+                expected_crc = finish_resp.fs_resp.crc32
+
+            # Verify CRC
+            if expected_crc is not None:
+                if (running_crc & 0xffffffff) != (expected_crc & 0xffffffff):
+                    print(f"CRC32 mismatch! Expected 0x{expected_crc:08x}, got 0x{running_crc & 0xffffffff:08x}")
+                    raise CommunicationError("CRC32 mismatch")
+
             print("Done!")
     
     def fs_mkdir(self, path: str):
@@ -830,6 +935,8 @@ def print_row(row: list[str]):
     parser.add_argument("--timeout", action="store", default=0.25, type=float)
     parser.add_argument("--chunk-timeout", action="store", default=0.5, type=float)
     parser.add_argument("--xfer-timeout", action="store", default=10, type=float)
+    parser.add_argument("--version1", action="store_true", default=False,
+                        help="Force protocol version 1 (legacy mode, skip version negotiation)")
     subparsers = parser.add_subparsers(required=True, dest="request")
     
     # ==== Help texts ==== #
@@ -999,7 +1106,7 @@ def print_row(row: list[str]):
         sys.exit(1)
     
     try:
-        link = Badgelink(port)
+        link = Badgelink(port, force_version1=args.version1)
         link.conn.dump_raw = args.dump_raw_bytes
         link.def_timeout = args.timeout
         link.chunk_timeout = args.chunk_timeout

From b3021e93303d553b1d8dbb52f40013b5a9a47598 Mon Sep 17 00:00:00 2001
From: Rene Schickbauer <github@cavac.at>
Date: Thu, 11 Dec 2025 18:41:51 +0100
Subject: [PATCH 4/8] BF

---
 .component_hash | 1 +
 CHECKSUMS.json  | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 .component_hash
 create mode 100644 CHECKSUMS.json

diff --git a/.component_hash b/.component_hash
new file mode 100644
index 0000000..124da67
--- /dev/null
+++ b/.component_hash
@@ -0,0 +1 @@
+793ba0d6780b2d8d59586ceee2d5c0d607dac7a0d8b5a8e1f924f515983c3b05
\ No newline at end of file
diff --git a/CHECKSUMS.json b/CHECKSUMS.json
new file mode 100644
index 0000000..e0fa6c1
--- /dev/null
+++ b/CHECKSUMS.json
@@ -0,0 +1 @@
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\ No newline at end of file

From ca0ebadef9b2c05b3dda6565e8f9498d241e9c4b Mon Sep 17 00:00:00 2001
From: Rene Schickbauer <github@cavac.at>
Date: Thu, 11 Dec 2025 21:38:29 +0100
Subject: [PATCH 5/8] Speed up SD card operations by a factor of 10 on Tanmatsu
 and Konsool

---
 badgelink_fs.c     | 78 ++++++++++++++++++++++++++++++++++++++++++----
 idf_component.yml  | 16 ++++++----
 tools/badgelink.py |  2 +-
 3 files changed, 83 insertions(+), 13 deletions(-)

diff --git a/badgelink_fs.c b/badgelink_fs.c
index 063a493..b76a113 100644
--- a/badgelink_fs.c
+++ b/badgelink_fs.c
@@ -6,17 +6,65 @@
 #include "dirent.h"
 #include "errno.h"
 #include "esp_crc.h"
+#include "esp_heap_caps.h"
 #include "esp_log.h"
 #include "fcntl.h"
 #include "stdio.h"
+#include "string.h"
 #include "sys/stat.h"
 #include "sys/types.h"
 #include "unistd.h"
 
 static char const TAG[] = "badgelink_fs";
 
+// Fast SD I/O helpers - use internal DMA RAM for stdio buffers
+#ifdef CONFIG_SD_FAST_IO
+#define BADGELINK_STDIO_BUF_SIZE 8192
+
+static FILE*  bl_fast_file   = NULL;
+static void*  bl_fast_buffer = NULL;
+
+static FILE* bl_sd_fopen(const char* path, const char* mode) {
+    FILE* f = fopen(path, mode);
+    if (f == NULL) return NULL;
+
+    // Allocate stdio buffer in internal DMA-capable RAM for fast SD card access
+    void* buf = heap_caps_malloc(BADGELINK_STDIO_BUF_SIZE, MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL);
+    if (buf != NULL) {
+        setvbuf(f, buf, _IOFBF, BADGELINK_STDIO_BUF_SIZE);
+        bl_fast_file   = f;
+        bl_fast_buffer = buf;
+    }
+    return f;
+}
+
+static void bl_sd_fclose(FILE* f) {
+    if (f == NULL) return;
+
+    // Check if this file has a tracked fast buffer
+    if (bl_fast_file == f && bl_fast_buffer != NULL) {
+        fclose(f);
+        free(bl_fast_buffer);
+        bl_fast_file   = NULL;
+        bl_fast_buffer = NULL;
+        return;
+    }
+    fclose(f);
+}
+#else
+// Fallback: just use regular fopen/fclose
+static inline FILE* bl_sd_fopen(const char* path, const char* mode) {
+    return fopen(path, mode);
+}
+
+static inline void bl_sd_fclose(FILE* f) {
+    if (f != NULL) fclose(f);
+}
+#endif
+
 static char     xfer_path[256];
 static FILE*    xfer_fd;
+static bool     xfer_is_sd;
 static uint32_t xfer_crc32;
 static uint32_t running_crc;
 
@@ -98,7 +146,11 @@ void badgelink_fs_xfer_download() {
 // Finish a FS transfer.
 void badgelink_fs_xfer_stop(bool abnormal) {
     if (abnormal) {
-        fclose(xfer_fd);
+        if (xfer_is_sd) {
+            bl_sd_fclose(xfer_fd);
+        } else {
+            fclose(xfer_fd);
+        }
         if (badgelink_xfer_is_upload) {
             ESP_LOGE(TAG, "FS upload aborted");
             unlink(xfer_path);
@@ -107,7 +159,11 @@ void badgelink_fs_xfer_stop(bool abnormal) {
         }
 
     } else if (badgelink_xfer_is_upload) {
-        fclose(xfer_fd);
+        if (xfer_is_sd) {
+            bl_sd_fclose(xfer_fd);
+        } else {
+            fclose(xfer_fd);
+        }
 
         if (running_crc != xfer_crc32) {
             ESP_LOGE(TAG, "FS upload CRC32 mismatch; expected %08" PRIx32 ", actual %08" PRIx32, xfer_crc32,
@@ -121,7 +177,11 @@ void badgelink_fs_xfer_stop(bool abnormal) {
 
     } else {
         ESP_LOGI(TAG, "FS download finished");
-        fclose(xfer_fd);
+        if (xfer_is_sd) {
+            bl_sd_fclose(xfer_fd);
+        } else {
+            fclose(xfer_fd);
+        }
 
         // For protocol version 2+, send the final CRC.
         if (badgelink_get_protocol_version() >= 2) {
@@ -236,7 +296,8 @@ void badgelink_fs_upload() {
 
     // Open target file for writing.
     strlcpy(xfer_path, req->path, sizeof(xfer_path));
-    xfer_fd = fopen(req->path, "w+b");
+    xfer_is_sd = (strncmp(req->path, "/sd", 3) == 0);
+    xfer_fd    = xfer_is_sd ? bl_sd_fopen(req->path, "w+b") : fopen(req->path, "w+b");
     if (!xfer_fd) {
         if (errno == ENOENT) {
             badgelink_status_not_found();
@@ -273,7 +334,8 @@ void badgelink_fs_download() {
 
     // Open target file for reading.
     strlcpy(xfer_path, req->path, sizeof(xfer_path));
-    xfer_fd = fopen(req->path, "rb");
+    xfer_is_sd = (strncmp(req->path, "/sd", 3) == 0);
+    xfer_fd    = xfer_is_sd ? bl_sd_fopen(req->path, "rb") : fopen(req->path, "rb");
     if (!xfer_fd) {
         if (errno == ENOENT) {
             badgelink_status_not_found();
@@ -294,7 +356,11 @@ void badgelink_fs_download() {
         struct stat statbuf;
         if (fstat(fileno(xfer_fd), &statbuf)) {
             ESP_LOGE(TAG, "%s: fstat failed, errno %d", __FUNCTION__, errno);
-            fclose(xfer_fd);
+            if (xfer_is_sd) {
+                bl_sd_fclose(xfer_fd);
+            } else {
+                fclose(xfer_fd);
+            }
             badgelink_status_int_err();
             return;
         }
diff --git a/idf_component.yml b/idf_component.yml
index 8dcb5b7..d059d6a 100644
--- a/idf_component.yml
+++ b/idf_component.yml
@@ -1,8 +1,12 @@
+dependencies:
+  badgeteam/appfs: '>=1.0.1'
+  idf: '>=5.4'
 description: Protobuf protocol for managing basic device functions
-url: https://github.com/badgeteam/esp32-component-badgelink
-repository: git://git@github.com:badgeteam/esp32-component-badgelink.git
 issues: https://github.com/badgeteam/esp32-component-badgelink/issues
-dependencies:
-  idf: ">=5.4"
-  badgeteam/appfs: ">=1.0.1"
-license: "MIT"
+license: MIT
+repository: git://github.com/badgeteam/esp32-component-badgelink.git
+repository_info:
+  commit_sha: aff9b2bbad34db5fc873c66bef247bfbf4ef6328
+  path: .
+url: https://github.com/badgeteam/esp32-component-badgelink
+version: 0.0.4
diff --git a/tools/badgelink.py b/tools/badgelink.py
index 8be2e7b..d75764b 100755
--- a/tools/badgelink.py
+++ b/tools/badgelink.py
@@ -1093,7 +1093,7 @@ def print_row(row: list[str]):
     
     try:
         if args.port:
-            port = Serial(port=args.port, baudrate=115200)
+            port = Serial(port=args.port, baudrate=4000000)
         elif args.inpipe:
             infd = open(args.inpipe, "rb")
             outfd = open(args.outpipe, "wb")

From f370093b39314fa87fc39031587b84345dd21f6f Mon Sep 17 00:00:00 2001
From: Rene Schickbauer <github@cavac.at>
Date: Fri, 12 Dec 2025 00:15:41 +0100
Subject: [PATCH 6/8] Cleanup

---
 .component_hash   |  1 -
 CHECKSUMS.json    |  1 -
 ProtocolV2.md     | 20 --------------------
 idf_component.yml | 16 ++++++----------
 4 files changed, 6 insertions(+), 32 deletions(-)
 delete mode 100644 .component_hash
 delete mode 100644 CHECKSUMS.json

diff --git a/.component_hash b/.component_hash
deleted file mode 100644
index 124da67..0000000
--- a/.component_hash
+++ /dev/null
@@ -1 +0,0 @@
-793ba0d6780b2d8d59586ceee2d5c0d607dac7a0d8b5a8e1f924f515983c3b05
\ No newline at end of file
diff --git a/CHECKSUMS.json b/CHECKSUMS.json
deleted file mode 100644
index e0fa6c1..0000000
--- a/CHECKSUMS.json
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file
diff --git a/ProtocolV2.md b/ProtocolV2.md
index 2d5a077..3fd9157 100644
--- a/ProtocolV2.md
+++ b/ProtocolV2.md
@@ -87,26 +87,6 @@ Version 2 changes how file downloads work to improve performance for large files
 
 **Benefit**: Download starts immediately without reading the entire file first.
 
-### Client Implementation for Downloads
-
-```
-1. Send download request
-2. Receive initial response with size (and crc32)
-3. If protocol version >= 2:
-   - Ignore crc32 field (it will be 0)
-   - Initialize local running_crc = 0
-4. Request chunks with XferContinue
-5. For each chunk received:
-   - Update local running_crc
-6. Send XferFinish
-7. If protocol version >= 2:
-   - Receive FsActionResp/AppfsActionResp with final crc32
-   - Compare with local running_crc
-8. If protocol version 1:
-   - Receive StatusOk
-   - Compare local running_crc with crc32 from step 2
-```
-
 ### Response Differences
 
 | Event | Version 1 | Version 2 |
diff --git a/idf_component.yml b/idf_component.yml
index d059d6a..8dcb5b7 100644
--- a/idf_component.yml
+++ b/idf_component.yml
@@ -1,12 +1,8 @@
-dependencies:
-  badgeteam/appfs: '>=1.0.1'
-  idf: '>=5.4'
 description: Protobuf protocol for managing basic device functions
-issues: https://github.com/badgeteam/esp32-component-badgelink/issues
-license: MIT
-repository: git://github.com/badgeteam/esp32-component-badgelink.git
-repository_info:
-  commit_sha: aff9b2bbad34db5fc873c66bef247bfbf4ef6328
-  path: .
 url: https://github.com/badgeteam/esp32-component-badgelink
-version: 0.0.4
+repository: git://git@github.com:badgeteam/esp32-component-badgelink.git
+issues: https://github.com/badgeteam/esp32-component-badgelink/issues
+dependencies:
+  idf: ">=5.4"
+  badgeteam/appfs: ">=1.0.1"
+license: "MIT"

From a9c3040a5236afa097b98336f9adee94f3d365a5 Mon Sep 17 00:00:00 2001
From: Rene Schickbauer <github@cavac.at>
Date: Fri, 12 Dec 2025 00:34:54 +0100
Subject: [PATCH 7/8] Cleanup

---
 tools/badgelink.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/badgelink.py b/tools/badgelink.py
index d75764b..8be2e7b 100755
--- a/tools/badgelink.py
+++ b/tools/badgelink.py
@@ -1093,7 +1093,7 @@ def print_row(row: list[str]):
     
     try:
         if args.port:
-            port = Serial(port=args.port, baudrate=4000000)
+            port = Serial(port=args.port, baudrate=115200)
         elif args.inpipe:
             infd = open(args.inpipe, "rb")
             outfd = open(args.outpipe, "wb")

From 7b14dcd95b640a4d588c801be4b7d69889fda0a4 Mon Sep 17 00:00:00 2001
From: cavac <github@cavac.at>
Date: Tue, 16 Dec 2025 15:46:29 +0100
Subject: [PATCH 8/8] Tweaks to badglelink V2, update badgelink.proto to match

---
 ProtocolV2.md                    |  27 ++++++-
 badgelink.pb.h                   |   8 +-
 badgelink.proto                  |  11 +++
 tools/badgelink.py               |  68 ++++------------
 tools/libraries/badgelink_pb2.py | 129 +++++++++++++++----------------
 5 files changed, 116 insertions(+), 127 deletions(-)

diff --git a/ProtocolV2.md b/ProtocolV2.md
index 3fd9157..e15e2d6 100644
--- a/ProtocolV2.md
+++ b/ProtocolV2.md
@@ -12,7 +12,7 @@ Sent by the client to negotiate the protocol version.
 
 | Field | Tag | Type | Description |
 |-------|-----|------|-------------|
-| client_version | 1 | uint16 | Highest protocol version supported by the client |
+| client_version | 1 | uint32 | Highest protocol version supported by the client |
 
 #### VersionResp (Response tag 6)
 
@@ -20,8 +20,8 @@ Sent by the server in response to a VersionReq.
 
 | Field | Tag | Type | Description |
 |-------|-----|------|-------------|
-| server_version | 1 | uint16 | Highest protocol version supported by the server |
-| negotiated_version | 2 | uint16 | Protocol version to use for this session |
+| server_version | 1 | uint32 | Highest protocol version supported by the server |
+| negotiated_version | 2 | uint32 | Protocol version to use for this session |
 
 ### Negotiation Algorithm
 
@@ -123,3 +123,24 @@ Use `--version1` when you need to connect using the legacy protocol, for example
 # Force version 1 protocol
 ./badgelink.sh --version1 fs download /sd/file.bin local_file.bin
 ```
+
+---
+
+## Revision History
+
+### 2025-12-16: Field Type Change (uint16 to uint32)
+
+The version fields in `VersionReq` and `VersionResp` were changed from `uint16` to `uint32`.
+
+**Reason**: Protocol Buffers (proto3) does not have a native `uint16` type. The smallest unsigned integer type available is `uint32`. While nanopb can generate C code with `uint16_t` fields using options, this creates inconsistency between the C implementation and other language bindings (Python, etc.) which use `uint32`.
+
+**Changes made**:
+
+| File | Change |
+|------|--------|
+| `badgelink.proto` | Added `VersionReq` and `VersionResp` messages with `uint32` fields |
+| `badgelink.pb.h` | Changed struct fields from `uint16_t` to `uint32_t` |
+| `tools/libraries/badgelink_pb2.py` | Regenerated from updated proto file |
+| `tools/badgelink.py` | Simplified to use generated protobuf classes instead of manual encoding |
+
+**Wire compatibility**: This change is wire-compatible. Protobuf varints encode small values (like version numbers 1, 2, etc.) identically regardless of whether the field is declared as `uint16` or `uint32`. Existing implementations will continue to work.
diff --git a/badgelink.pb.h b/badgelink.pb.h
index 2250ce8..454ec23 100644
--- a/badgelink.pb.h
+++ b/badgelink.pb.h
@@ -103,15 +103,15 @@ typedef enum _badgelink_NvsValueType {
 /* Protocol version request. */
 typedef struct _badgelink_VersionReq {
     /* Highest protocol version supported by client. */
-    uint16_t client_version;
+    uint32_t client_version;
 } badgelink_VersionReq;
 
 /* Protocol version response. */
 typedef struct _badgelink_VersionResp {
     /* Highest protocol version supported by server. */
-    uint16_t server_version;
+    uint32_t server_version;
     /* Negotiated protocol version (min of client and server). */
-    uint16_t negotiated_version;
+    uint32_t negotiated_version;
 } badgelink_VersionResp;
 
 typedef struct _badgelink_StartAppReq {
@@ -795,6 +795,8 @@ extern const pb_msgdesc_t badgelink_NvsActionResp_msg;
 #define badgelink_Request_size                   4153
 #define badgelink_Response_size                  5134
 #define badgelink_StartAppReq_size               179
+#define badgelink_VersionReq_size                6
+#define badgelink_VersionResp_size               12
 
 #ifdef __cplusplus
 } /* extern "C" */
diff --git a/badgelink.proto b/badgelink.proto
index 2256260..e8cfa8f 100644
--- a/badgelink.proto
+++ b/badgelink.proto
@@ -190,6 +190,7 @@ message Request {
     NvsActionReq nvs_action = 4;
     StartAppReq start_app = 5;
     XferReq xfer_ctrl = 6;
+    VersionReq version_req = 7;
   }
 }
 
@@ -199,6 +200,7 @@ message Response {
     AppfsActionResp appfs_resp = 3;
     FsActionResp fs_resp = 4;
     NvsActionResp nvs_resp = 5;
+    VersionResp version_resp = 6;
   }
 
   StatusCode status_code = 1;
@@ -208,3 +210,12 @@ message StartAppReq {
   string slug = 1;
   string arg = 2;
 }
+
+message VersionReq {
+  uint32 client_version = 1;
+}
+
+message VersionResp {
+  uint32 server_version = 1;
+  uint32 negotiated_version = 2;
+}
diff --git a/tools/badgelink.py b/tools/badgelink.py
index 8be2e7b..a8c1b17 100755
--- a/tools/badgelink.py
+++ b/tools/badgelink.py
@@ -332,6 +332,8 @@ def simple_request(self, request: Request|FsActionReq|AppfsActionReq|NvsActionRe
             request = Request(upload_chunk=request)
         elif type(request) == StartAppReq:
             request = Request(start_app=request)
+        elif type(request) == VersionReq:
+            request = Request(version_req=request)
         elif type(request) != Request:
             raise TypeError("Invalid request type")
         
@@ -397,65 +399,25 @@ def _negotiate_version(self):
         Sends a VersionReq and handles the response.
         """
         try:
-            # Build VersionReq manually since it's not in the generated protobuf
-            # Request tag 7, field 1 = client_version (uint16)
-            # We'll send this as a raw request
-            self.conn.serial_no = (self.conn.serial_no + 1) % (1 << 32)
+            resp = self.conn.simple_request(
+                VersionReq(client_version=self.PROTOCOL_VERSION),
+                timeout=self.def_timeout
+            )
 
-            # Create a packet with version request
-            # The version_req is tag 7 in Request oneof
-            # VersionReq has client_version as field 1 (uint32 in protobuf wire format)
-            packet = Packet(serial=self.conn.serial_no)
-            packet.request.SetInParent()
-
-            # Manually encode version request: tag 7, field 1 = PROTOCOL_VERSION
-            # Using protobuf wire format: field 1 varint = client_version
-            version_req_bytes = b'\x08' + bytes([self.PROTOCOL_VERSION])  # field 1, varint
-
-            # Set the raw bytes for the version_req field (tag 7)
-            # This is a workaround since VersionReq isn't in the generated code
-            raw_request = b'\x3a' + bytes([len(version_req_bytes)]) + version_req_bytes  # tag 7, length-delimited
-
-            # Build full packet manually
-            serial_bytes = b'\x08' + self._encode_varint(self.conn.serial_no)  # field 1 = serial
-            request_wrapper = b'\x12' + bytes([len(raw_request)]) + raw_request  # field 2 = request
-
-            full_packet = serial_bytes + request_wrapper
-            self.conn.send_frame(full_packet)
-
-            resp_packet = self.conn.recv_packet(self.def_timeout)
-
-            if resp_packet.response.status_code == StatusCode.StatusNotSupported:
-                # Old server, use protocol version 1
-                self.protocol_version = 1
-                print("Server uses protocol version 1 (legacy)")
-            elif resp_packet.response.status_code == StatusCode.StatusOk:
-                # Parse version response from raw bytes
-                # Response tag 6 = version_resp
-                # VersionResp: field 1 = server_version, field 2 = negotiated_version
-                if resp_packet.response.HasField('fs_resp'):
-                    # Version response comes back as fs_resp due to tag collision workaround
-                    # Actually, we need to check the raw response
-                    pass
-                # For now, if we got StatusOk, assume v2
-                self.protocol_version = 2
-                print(f"Negotiated protocol version {self.protocol_version}")
+            if resp.HasField('version_resp'):
+                self.protocol_version = resp.version_resp.negotiated_version
+                print(f"Negotiated protocol version {self.protocol_version} (server supports v{resp.version_resp.server_version})")
             else:
-                # Unexpected response, fall back to v1
+                # Unexpected response format, fall back to v1
                 self.protocol_version = 1
-        except (TimeoutError, NotSupportedError):
+        except NotSupportedError:
             # Server doesn't support version negotiation, use v1
             self.protocol_version = 1
             print("Server uses protocol version 1 (legacy)")
-
-    def _encode_varint(self, value: int) -> bytes:
-        """Encode an integer as a protobuf varint."""
-        result = []
-        while value > 127:
-            result.append((value & 0x7f) | 0x80)
-            value >>= 7
-        result.append(value)
-        return bytes(result)
+        except TimeoutError:
+            # Server didn't respond, use v1
+            self.protocol_version = 1
+            print("Server uses protocol version 1 (legacy)")
     
     def start_app(self, slug: str, app_arg: str):
         """
diff --git a/tools/libraries/badgelink_pb2.py b/tools/libraries/badgelink_pb2.py
index 70a5fce..f84a64d 100644
--- a/tools/libraries/badgelink_pb2.py
+++ b/tools/libraries/badgelink_pb2.py
@@ -1,22 +1,11 @@
 # -*- coding: utf-8 -*-
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
-# NO CHECKED-IN PROTOBUF GENCODE
 # source: badgelink.proto
-# Protobuf Python Version: 6.33.1
 """Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import runtime_version as _runtime_version
 from google.protobuf import symbol_database as _symbol_database
-from google.protobuf.internal import builder as _builder
-_runtime_version.ValidateProtobufRuntimeVersion(
-    _runtime_version.Domain.PUBLIC,
-    6,
-    33,
-    1,
-    '',
-    'badgelink.proto'
-)
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -24,61 +13,65 @@
 
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x0f\x62\x61\x64gelink.proto\x12\tbadgelink\"\x9f\x01\n\x0e\x41ppfsActionReq\x12,\n\x08metadata\x18\x02 \x01(\x0b\x32\x18.badgelink.AppfsMetadataH\x00\x12\x0e\n\x04slug\x18\x03 \x01(\tH\x00\x12%\n\x04type\x18\x01 \x01(\x0e\x32\x17.badgelink.FsActionType\x12\r\n\x05\x63rc32\x18\x04 \x01(\r\x12\x13\n\x0blist_offset\x18\x05 \x01(\rB\x04\n\x02id\"\xb0\x01\n\x0f\x41ppfsActionResp\x12,\n\x08metadata\x18\x01 \x01(\x0b\x32\x18.badgelink.AppfsMetadataH\x00\x12\x0f\n\x05\x63rc32\x18\x02 \x01(\rH\x00\x12$\n\x04list\x18\x03 \x01(\x0b\x32\x14.badgelink.AppfsListH\x00\x12#\n\x05usage\x18\x04 \x01(\x0b\x32\x12.badgelink.FsUsageH\x00\x12\x0c\n\x04size\x18\x05 \x01(\rB\x05\n\x03val\"G\n\tAppfsList\x12&\n\x04list\x18\x01 \x03(\x0b\x32\x18.badgelink.AppfsMetadata\x12\x12\n\ntotal_size\x18\x02 \x01(\r\"K\n\rAppfsMetadata\x12\x0c\n\x04slug\x18\x01 \x01(\t\x12\r\n\x05title\x18\x02 \x01(\t\x12\x0f\n\x07version\x18\x03 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+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x0f\x62\x61\x64gelink.proto\x12\tbadgelink\"\x9f\x01\n\x0e\x41ppfsActionReq\x12,\n\x08metadata\x18\x02 \x01(\x0b\x32\x18.badgelink.AppfsMetadataH\x00\x12\x0e\n\x04slug\x18\x03 \x01(\tH\x00\x12%\n\x04type\x18\x01 \x01(\x0e\x32\x17.badgelink.FsActionType\x12\r\n\x05\x63rc32\x18\x04 \x01(\r\x12\x13\n\x0blist_offset\x18\x05 \x01(\rB\x04\n\x02id\"\xb0\x01\n\x0f\x41ppfsActionResp\x12,\n\x08metadata\x18\x01 \x01(\x0b\x32\x18.badgelink.AppfsMetadataH\x00\x12\x0f\n\x05\x63rc32\x18\x02 \x01(\rH\x00\x12$\n\x04list\x18\x03 \x01(\x0b\x32\x14.badgelink.AppfsListH\x00\x12#\n\x05usage\x18\x04 \x01(\x0b\x32\x12.badgelink.FsUsageH\x00\x12\x0c\n\x04size\x18\x05 \x01(\rB\x05\n\x03val\"G\n\tAppfsList\x12&\n\x04list\x18\x01 \x03(\x0b\x32\x18.badgelink.AppfsMetadata\x12\x12\n\ntotal_size\x18\x02 \x01(\r\"K\n\rAppfsMetadata\x12\x0c\n\x04slug\x18\x01 \x01(\t\x12\r\n\x05title\x18\x02 \x01(\t\x12\x0f\n\x07version\x18\x03 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+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'badgelink_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
 
-_globals = globals()
-_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
-_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'badgelink_pb2', _globals)
-if not _descriptor._USE_C_DESCRIPTORS:
-  DESCRIPTOR._loaded_options = None
-  _globals['_FSACTIONTYPE']._serialized_start=2376
-  _globals['_FSACTIONTYPE']._serialized_end=2567
-  _globals['_NVSACTIONTYPE']._serialized_start=2569
-  _globals['_NVSACTIONTYPE']._serialized_end=2663
-  _globals['_NVSVALUETYPE']._serialized_start=2666
-  _globals['_NVSVALUETYPE']._serialized_end=2872
-  _globals['_STATUSCODE']._serialized_start=2875
-  _globals['_STATUSCODE']._serialized_end=3107
-  _globals['_XFERREQ']._serialized_start=3109
-  _globals['_XFERREQ']._serialized_end=3167
-  _globals['_APPFSACTIONREQ']._serialized_start=31
-  _globals['_APPFSACTIONREQ']._serialized_end=190
-  _globals['_APPFSACTIONRESP']._serialized_start=193
-  _globals['_APPFSACTIONRESP']._serialized_end=369
-  _globals['_APPFSLIST']._serialized_start=371
-  _globals['_APPFSLIST']._serialized_end=442
-  _globals['_APPFSMETADATA']._serialized_start=444
-  _globals['_APPFSMETADATA']._serialized_end=519
-  _globals['_CHUNK']._serialized_start=521
-  _globals['_CHUNK']._serialized_end=560
-  _globals['_FSACTIONREQ']._serialized_start=562
-  _globals['_FSACTIONREQ']._serialized_end=678
-  _globals['_FSACTIONRESP']._serialized_start=681
-  _globals['_FSACTIONRESP']._serialized_end=846
-  _globals['_FSDIRENT']._serialized_start=848
-  _globals['_FSDIRENT']._serialized_end=888
-  _globals['_FSDIRENTLIST']._serialized_start=890
-  _globals['_FSDIRENTLIST']._serialized_end=959
-  _globals['_FSSTAT']._serialized_start=961
-  _globals['_FSSTAT']._serialized_end=1044
-  _globals['_FSUSAGE']._serialized_start=1046
-  _globals['_FSUSAGE']._serialized_end=1083
-  _globals['_NVSACTIONREQ']._serialized_start=1086
-  _globals['_NVSACTIONREQ']._serialized_end=1271
-  _globals['_NVSACTIONRESP']._serialized_start=1273
-  _globals['_NVSACTIONRESP']._serialized_end=1379
-  _globals['_NVSENTRIESLIST']._serialized_start=1381
-  _globals['_NVSENTRIESLIST']._serialized_end=1458
-  _globals['_NVSENTRY']._serialized_start=1460
-  _globals['_NVSENTRY']._serialized_end=1539
-  _globals['_NVSVALUE']._serialized_start=1541
-  _globals['_NVSVALUE']._serialized_end=1659
-  _globals['_PACKET']._serialized_start=1662
-  _globals['_PACKET']._serialized_end=1792
-  _globals['_REQUEST']._serialized_start=1795
-  _globals['_REQUEST']._serialized_end=2082
-  _globals['_RESPONSE']._serialized_start=2085
-  _globals['_RESPONSE']._serialized_end=2331
-  _globals['_STARTAPPREQ']._serialized_start=2333
-  _globals['_STARTAPPREQ']._serialized_end=2373
+  DESCRIPTOR._options = None
+  _FSACTIONTYPE._serialized_start=2575
+  _FSACTIONTYPE._serialized_end=2766
+  _NVSACTIONTYPE._serialized_start=2768
+  _NVSACTIONTYPE._serialized_end=2862
+  _NVSVALUETYPE._serialized_start=2865
+  _NVSVALUETYPE._serialized_end=3071
+  _STATUSCODE._serialized_start=3074
+  _STATUSCODE._serialized_end=3306
+  _XFERREQ._serialized_start=3308
+  _XFERREQ._serialized_end=3366
+  _APPFSACTIONREQ._serialized_start=31
+  _APPFSACTIONREQ._serialized_end=190
+  _APPFSACTIONRESP._serialized_start=193
+  _APPFSACTIONRESP._serialized_end=369
+  _APPFSLIST._serialized_start=371
+  _APPFSLIST._serialized_end=442
+  _APPFSMETADATA._serialized_start=444
+  _APPFSMETADATA._serialized_end=519
+  _CHUNK._serialized_start=521
+  _CHUNK._serialized_end=560
+  _FSACTIONREQ._serialized_start=562
+  _FSACTIONREQ._serialized_end=678
+  _FSACTIONRESP._serialized_start=681
+  _FSACTIONRESP._serialized_end=846
+  _FSDIRENT._serialized_start=848
+  _FSDIRENT._serialized_end=888
+  _FSDIRENTLIST._serialized_start=890
+  _FSDIRENTLIST._serialized_end=959
+  _FSSTAT._serialized_start=961
+  _FSSTAT._serialized_end=1044
+  _FSUSAGE._serialized_start=1046
+  _FSUSAGE._serialized_end=1083
+  _NVSACTIONREQ._serialized_start=1086
+  _NVSACTIONREQ._serialized_end=1271
+  _NVSACTIONRESP._serialized_start=1273
+  _NVSACTIONRESP._serialized_end=1379
+  _NVSENTRIESLIST._serialized_start=1381
+  _NVSENTRIESLIST._serialized_end=1458
+  _NVSENTRY._serialized_start=1460
+  _NVSENTRY._serialized_end=1539
+  _NVSVALUE._serialized_start=1541
+  _NVSVALUE._serialized_end=1659
+  _PACKET._serialized_start=1662
+  _PACKET._serialized_end=1792
+  _REQUEST._serialized_start=1795
+  _REQUEST._serialized_end=2128
+  _RESPONSE._serialized_start=2131
+  _RESPONSE._serialized_end=2425
+  _STARTAPPREQ._serialized_start=2427
+  _STARTAPPREQ._serialized_end=2467
+  _VERSIONREQ._serialized_start=2469
+  _VERSIONREQ._serialized_end=2505
+  _VERSIONRESP._serialized_start=2507
+  _VERSIONRESP._serialized_end=2572
 # @@protoc_insertion_point(module_scope)