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ESP32-C6 BLE-to-WiFi bridge for Cybex E-Priam stroller. Control rocking, drive modes, and monitor battery via Home Assistant or web interface. Native ESP-IDF with OTA updates.

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esPriam32

ESP32-C6 Smart Control for Cybex E-Priam Stroller — Home Assistant integration, extended rocking timer, and OTA updates

A native ESP-IDF firmware for ESP32-C6 that acts as a BLE-to-WiFi bridge for the Cybex E-Priam electric stroller. Control rocking, drive modes (ECO/TOUR/BOOST), and monitor battery via Home Assistant, MQTT, or a beautiful web interface.

Keywords: Cybex E-Priam, smart stroller, baby tech, ESP32 BLE, Home Assistant stroller, MQTT baby monitor, electric pram hack, nursery automation

Web Interface

Introduction

I was getting tired of Cybex never updating their useless app, so I decided to create my own. This lets you integrate your E-Priam to Home Assistant or anything eating MQTT.

Your child will love the Auto-mode, because the default max duration on the E-Priam is 30 minutes — the exact same as a baby's sleep cycle. With Auto it will automatically jump back to 30 minutes when it reaches 10 minutes left on the timer.

The config page lets you translate the entity names sent over MQTT. That's just a shortcut for you to be able to push it to HomeKit and say: "Hey Siri, turn on rocking"

Features

  • BLE Connection - Automatic discovery and connection to E-Priam stroller
  • BLE Notifications - Real-time updates from stroller (battery, status)
  • Web Interface - Beautiful mobile-friendly control panel
  • Home Assistant - Full MQTT integration with auto-discovery
  • Rocking Control - 30min to 3 hour duration options with countdown
  • Auto-Renew Mode - Continuous rocking that auto-renews before timeout
  • Battery Monitoring - Real-time battery percentage from stroller
  • Drive Modes - ECO, TOUR, BOOST mode switching
  • OTA Updates - Over-the-air firmware updates via web browser
  • Live BLE Log - Real-time connection status in web UI

Hardware Requirements

Tested Hardware

This project has been developed and tested with:

  • Seeed Studio XIAO ESP32-C6 - Recommended, compact and reliable

Compatible Hardware

Should work with any ESP32-C6 board, but only the XIAO ESP32-C6 has been verified:

Board Status Notes
Seeed XIAO ESP32-C6 ✅ Tested Recommended
ESP32-C6-DevKitC-1 ⚠️ Untested Should work
Other ESP32-C6 boards ⚠️ Untested Should work

Other Requirements

  • Cybex E-Priam stroller with electronic drive unit
  • WiFi network (2.4 GHz)
  • USB-C cable for flashing
  • Optional: MQTT broker for Home Assistant integration

Quick Start

1. Install PlatformIO

pip install platformio

2. Configure WiFi and MQTT

Edit src/main.c and update these values:

#define MQTT_BROKER "mqtt://YOUR_MQTT_BROKER_IP"
#define MQTT_USER "your_mqtt_username"
#define MQTT_PASS "your_mqtt_password"

#define WIFI_SSID "YourWiFiNetwork"
#define WIFI_PASS "YourWiFiPassword"

3. Build and Flash

pio run --target upload

4. Find the Device

After flashing, the ESP32-C6 will:

  1. Connect to your WiFi network
  2. Get an IP address via DHCP
  3. Start scanning for the E-Priam stroller

Check your router's DHCP leases or use:

arp -a | grep -i espressif

Web Interface

Access the web interface at http://<device-ip>/

Status Bar

Indicator Description
BLE (green/red) Connected to stroller
MQTT (green/red) Connected to broker
Battery XX% Stroller battery level
Mode Current drive mode (ECO/TOUR/BOOST)
Auto (green/red) Auto-renew status

Rocking Controls

Button Description
5m / 15m / 30m Start rocking with timer
Auto Continuous rocking (auto-renews at 10 min remaining)
Stop Stop rocking

Drive Mode Controls

Button Description
ECO Energy-saving mode
TOUR Normal mode
BOOST Maximum power mode

Additional Pages

URL Description
/ Main control interface
/config Configure entity names for Home Assistant
/ota Upload new firmware over-the-air
/api/status JSON status endpoint
/api/log BLE log (newest first)

Home Assistant Integration

The device automatically publishes MQTT discovery messages. Entities appear automatically in Home Assistant.

Entities Created

Entity Type Description
sensor.epriam_battery Sensor Battery percentage
switch.epriam_rocking Switch Rocking on/off
switch.epriam_autorenew Switch Auto-renew mode
select.epriam_mode Select Drive mode (ECO/TOUR/BOOST)
number.epriam_intensity Number Rocking intensity (0-100%)
binary_sensor.epriam_connected Binary Sensor BLE connection status
sensor.epriam_ip Sensor Device IP address

Example Automation

automation:
  - alias: "Start rocking when baby monitor triggers"
    trigger:
      - platform: state
        entity_id: binary_sensor.baby_crying
        to: "on"
    action:
      - service: switch.turn_on
        target:
          entity_id: switch.epriam_autorenew

REST API Reference

Status Endpoint

curl http://<ip>/api/status

Response:

{
  "connected": true,
  "mqtt": true,
  "battery": 69,
  "battery_leds": 2,
  "drive_mode": 1,
  "rocking": true,
  "auto_renew": false,
  "intensity": 50,
  "remaining_sec": 245,
  "rock_minutes": 5
}

Control Endpoints

# Drive modes
curl http://<ip>/api/mode/eco
curl http://<ip>/api/mode/tour
curl http://<ip>/api/mode/boost

# Rocking control
curl "http://<ip>/api/rock/start?min=15&intensity=50"
curl http://<ip>/api/rock/stop
curl http://<ip>/api/rock/autorenew

# BLE scan
curl http://<ip>/api/rescan

OTA Updates

  1. Build new firmware:

    pio run

  2. Navigate to http://<device-ip>/ota

  3. Select file: .pio/build/esp32-c6/firmware.bin

  4. Click "Start OTA" and wait for completion

  5. Device reboots automatically

Troubleshooting

Device not connecting to stroller

  1. Check the BLE log on the web interface
  2. Ensure the stroller is powered on
  3. Move ESP32-C6 closer (< 3 meters recommended)
  4. Press "Scan" button in web UI
  5. Check serial output: pio device monitor

Weak BLE Signal

  • RSSI should be above -85 dBm for reliable connection
  • Optimal range is 1-2 meters from stroller
  • The E-Priam BLE module (Microchip RN4871) has limited range

MQTT Not Connecting

  1. Verify broker IP, username, and password in code
  2. Check that MQTT broker is running
  3. Verify Home Assistant MQTT integration is configured

Technical Details

BLE Protocol

The E-Priam uses a Microchip RN4871 BLE module.

Manufacturer ID: 0x078D

Service UUID: a1fc0101-78d3-40c2-9b6f-3c5f7b2797df

Characteristic UUID Suffix Description
Status 0102 Read status bytes
Drive Mode 0103 Write-only: 1=ECO, 2=TOUR, 3=BOOST
Rocking 0104 Write: [0x01, minutes, intensity%] or [0x00]
Battery LED 0105 Read: LED count (1-3)

Rocking Command Format

Start: [0x01, minutes, intensity]
  - minutes: 0 = continuous, 1-30 = timer
  - intensity: 0-100 percent

Stop:  [0x00]

Memory Usage

RAM:   ~15% (50KB of 328KB)
Flash: ~33% (1.4MB of 4MB)

Troubleshooting

E-Priam Won't Connect

If the ESP32 keeps failing to connect with reason=0x3E, the stroller may need a reset:

  1. Lower the handle bar from fully extended to the lowest position
  2. Extend the handle bar back to fully extended
  3. Turn the E-Priam off
  4. Turn the E-Priam on

This typically happens after using the official Cybex app, which can leave the stroller's BLE in an unresponsive state.

Drive Mode Characteristic

The drive mode characteristic (0x0103) is write-only — it cannot be read. The firmware tracks the mode locally after sending a write command.

Configuration

Entity names can be customized via the /config page. These are stored in NVS (non-volatile storage) and persist across reboots.

Default names (Norwegian):

  • Device: "Cybex E-Priam"
  • Battery: "Batteri"
  • Rocking: "Vugging"
  • Auto-renew: "Auto-forny"
  • Mode: "Modus"
  • Intensity: "Intensitet"
  • Connected: "Tilkoblet"

Building from Source

# Clone repository
git clone https://github.com/yourusername/Priam.git
cd Priam/esp32-c6

# Install dependencies (handled by PlatformIO)
pio pkg install

# Build
pio run

# Upload to device
pio run --target upload

# Monitor serial output
pio device monitor

Project Structure

esp32-c6/
├── src/
│   └── main.c          # All firmware code
├── platformio.ini      # PlatformIO configuration
├── partitions.csv      # Flash partition table
├── sdkconfig.defaults  # ESP-IDF settings
└── README.md           # This file

License

MIT License - See LICENSE file for details.

Contributing

Pull requests are welcome! Please ensure code follows the existing style.

Credits

About

ESP32-C6 BLE-to-WiFi bridge for Cybex E-Priam stroller. Control rocking, drive modes, and monitor battery via Home Assistant or web interface. Native ESP-IDF with OTA updates.

Topics

mqtt iot automation ota esp32 bluetooth smart-home ble home-assistant esp-idf nimble nursery baby stroller priam esp32-c6 cybex e-priam

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