This arduino sketch implements an ESP32 BLE client for XIaomi Mi Flora Plant sensors, pushing the meaasurements to an MQTT server.
Hardware:
- ESP32
- Xiaomi Mi Plant Sensor (firmware revision >= 2.6.6)
Software:
- MQTT server
- Copy config.h.example into config.h and update seetings according to your environment:
- WLAN SSID and password
- MQTT Server address
- Open ino sketch in Arduino, compile & upload.
The ESP32 will scan BLE devices to find Xiaomi Mi Plant sensors. Then it perform a single connection attempt to the Xiaomi Mi Plant sensor, read the sensor data & push it to the MQTT server. The ESP32 will enter deep sleep mode after all sensors have been read and sleep for X minutes before repeating the exercise... Up to X attempst per sensor are performed when reading the data fails.
- MAX_DEVICES - the maximum number of devices that can be scanned at once
- BLE_SCAN_DURATION - duration of the initial BLE scan used to look for Xiaomi Mi Plant sensors
- SLEEP_DURATION - how long should the device sleep between sensor reads?
- EMERGENCY_HIBERNATE - how long after wakeup should the device forcefully go to sleep (e.g. when something gets stuck)?
- RETRY - how ofter should a single device be tried on each run?
Some "nice to have" features are not yet implemented or cannot be implemented:
- OTA updates: I didn't manage to implement OTA update capabilities due to program size constraints: BLE and WLAN brings the sketch up to 90% of the size limit, so I decided to use the remaining 10% for something more useful than OTA...
The sketch does not fit into the default arduino parition size of around 1.3MB. You'll need to change your default parition table and increase maximum build size to at least 1.6MB. On Arduino IDE this can be achieved using "Tools -> Partition Scheme -> No OTA"
Many thanks go to the guys at https://github.com/open-homeautomation/miflora for figuring out the sensor protocol.