GOVEE H5074 Temperature scanner for ESP32

Proof of concept. May leak memory, crash, etc.

Uses ArduinoJSON, NimBLE-Arduino, ESP-NOW

Listens for BLE advertisements from any GOVEE 5074 sensor

• extracts temperature and humidity from BLE advertisement
• creates JSON doc
• forwards doc to ESP-NOW broadcast address

Sample ESP-NOW packet:

{
  "D":"ESP-GOVEE",
  "Govee_H5074_DB3A/tempInC":18.87999916,
  "Govee_H5074_DB3A/humidity":51.66999817,
  "Govee_H5074_DB3A/battery":97
}

The companion app to this: https://github.com/mkjanke/ESP32-Now-JSON-GW. This gateway app receives ESP-NOW broadcasts and forwards them to an attached serial port.

Govee H5074 decode notes

Notes on passively monitoring Govee BLE 5074 temperature sensor using and ESP32

Reference: https://github.com/Thrilleratplay/GoveeWatcher

Govee H5074 Advertising Packet (NimBLE getPayload()):

Byte: 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
      -----------------------------------------------------------------------------------------------------------
Data: 02 01 06 03 03 88 ec 11 09 47 6f 76 65 65 5f 48 35 30 37 34 5f 46 37 31 41 0a ff 88 ec 00 58 0a e6 11 64 02
Data: 02 01 06 03 03 88 ec 11 09 47 6f 76 65 65 5f 48 35 30 37 34 5f 46 37 31 41 0a ff 88 ec 00 b7 09 a0 12 64 02
                     -----       -----------------------------------------------       -----    ----- ----- --
                     Mfg Id       G  o  v  e  e  _  H  5  0  7  4  _  F  7  1  A       Mfg Id   TempC Humid Bat

Mfg. Data Field (NimBLE getManufacturerData().data())

88 ec 00 f8 09 cf 11 64 02
-----    ----- ----- -- 
Mfg Id   TempC Humid Bat

Example Mfg. data:

88ec00580ae6116402

Temperature (C): 580a

• Convert to int: data[3] << 0) | (data[4]) << 8 = 2648
• Divide by 100 = 26.48 deg. C

Humidity: e611

• Convert to int: data[5] << 0) | (data[6]) << 8 = 4582
• Divide by 100 = 45.82 %

Battery Pct: 64 = 64 hex = 100%