RAK3172 Wakeup by RF?

[anusornint (anusorn)]

With RUI_4.0.5_RAK3172-E and P2P mode, Is it posible to wakeup by radio? How to do?

[beegee (Bernd Giesecke)]

If you setup the device correct, it will automatically wake-up on a received data packet.

If using AT command interface in LoRa P2P mode:

AT+PRECV=xxxxx

xxxxx larger than 0 will set the LoRa transceiver into RX mode and if a valid packet arrived, it will give feedback over UART2 with

+EVT:RXP2P:-112:1:1234

More details about AT+PRECV ==> AT Command Manual | RAKwireless Documentation Center

When using custom firmware based on RUI3 API:
Define callback functions:

/**
 * @brief LoRa P2P callback if a packet was received
 *
 * @param data
 */
void recv_cb(rui_lora_p2p_recv_t data)
{
	Serial.printf("P2P RX, RSSI %d, SNR %d\r\n", data.Rssi, data.Snr);
	for (int i = 0; i < data.BufferSize; i++)
	{
		Serial.printf("%02X", data.Buffer[i]);
	}
	Serial.print("\r\n");
}

/**
 * @brief LoRa P2P callback if a packet was sent
 *
 */
void send_cb(void)
{
	Serial.println("P2P TX finished");
}

Initialize the callbacks and set P2P RX mode:

	api.lora.registerPRecvCallback(recv_cb);
	api.lora.registerPSendCallback(send_cb);

	// Enable RX mode (always with TX allowed)
	api.lora.precv(65533);

Keep in mind that in RX mode, the LoRa transceiver is not in sleep mode. You have to expect a current consumption of several mA.
However, the MCU itself can go into sleep mode.

[anusornint (anusorn)]

I just realized that in RX mode, the LoRa transceiver is not in sleep mode, Thank you.