Sunna LoRa RMM v3.0

Board

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Connectors

1- 3V3
2- NC (not connected)
3- Rx (MPPT's Tx)
4- GND

Modes

Firmware Programing

1- Pressing RST button
2- Pressing IO0 button
3- Releasing RST button
4- Releasing IO0 button 

Setting LoRa Keys

1- Pressing RST button
2- Pressing WEB button
3- Releasing RST button
4- Releasing WEB button