RAK11300 Arduino COM port problem!

[mykhalych90 (Oleksiy Veretyuk)]

When using examples (WisBlock/examples/RAK11300/communications/LoRa/LoRaWAN/LoRaWAN_OTAA_ABP at master · RAKWireless/WisBlock · GitHub), we observe a problem with the Com port. When the COM port is opened, the next time it is sent, WisBlock stops working, packets are not sent. Only reboot helps.
If you do not open the COM port, then everything works ok, the packets are sent normally.

perhaps this is due to the update of all examples after the problem with the timer was resolved

RAK11310 stop sending LoRaWAN messages! Critical!

When something in a project of mine stops working, after checking that no other conditions have changed, I make a point to personally verify the behavior of the part of the software that is known to have changed. Though you might first see what happens if you revert to the old version.

After “Sending frame now…” everything stops working

[beegee (Bernd Giesecke)]

Hi @mykhalych90

Can you try to remove the Serial.println() from void tx_lora_periodic_handler(void) and try?

void tx_lora_periodic_handler(void)
{
	appTimer.attach(tx_lora_periodic_handler, (std::chrono::microseconds)(LORAWAN_APP_INTERVAL * 1000));
	// Serial.println("Sending frame now...");
	// This is a timer interrupt, do not do lengthy things here. Signal the loop() instead
	send_now = true;
}

Seems the use of Serial in the timer interrupt is causing the problem.

[mykhalych90 (Oleksiy Veretyuk)]

yes, that was probably the problem.
commented out the line - checked, everything works ok
Thanks

[beegee (Bernd Giesecke)]

Sorry for that. I already updated the code in Github.