No join after reset but frame counter is reset

#1

I’m debugging why my device disappears from the TTN Console. I see in the Gateway console, that it is sending (unconfirmed) uplink messages, but the frame counter is low as if started again from 0.

I pressed the reset button. The serial monitor shows this:

08:52:00.517 -> Voltage: 4204
08:52:00.517 -> Humidity: 54.70%  Temperature: 24.22°C  Pressure: 1004.94hPa 
08:52:00.517 -> AppDataSize: 18 AppData: 0 0 9 118 21 93 0 0 0 0 0 0 0 0 136 141 16 108 .
08:52:00.517 -> unconfirmed uplink sending ...
08:53:00.914 -> Into send state
08:53:00.914 -> 
08:53:01.368 -> Voltage: 4206
08:53:01.368 -> Humidity: 54.77%  Temperature: 24.24°C  Pressure: 1004.95hPa 
08:53:01.368 -> AppDataSize: 18 AppData: 0 0 9 120 21 100 0 0 0 0 0 0 0 0 136 143 16 110 .
08:53:01.368 -> unconfirmed uplink sending ...
08:53:56.912 -> Copyright @2019-2020 Heltec Automation.All rights reserved.
08:53:57.159 -> ChipID:C3A65983111D
08:53:57.159 -> 
08:53:57.159 -> Wait 3s for user key to rejoin network
08:54:00.222 -> 
08:54:00.222 -> LoRaWAN EU868 Class A start!
08:54:00.222 -> 
08:54:00.423 -> User key not detected,Use reserved Net
08:54:00.423 -> 
08:54:00.423 -> Next packet send 9413 ms later(random time from 0 to APP_TX_DUTYCYCLE)
08:54:00.423 -> 
08:54:00.423 -> Interrupt attached
08:54:00.423 -> Starting w⸮Into send state
08:54:09.843 -> 
08:54:10.292 -> Voltage: 4204
08:54:10.292 -> Humidity: 54.85%  Temperature: 24.27°C  Pressure: 1004.92hPa 
08:54:10.292 -> AppDataSize: 18 AppData: 0 0 9 123 21 109 0 0 0 0 0 0 0 0 136 140 16 108 .
08:54:10.292 -> unconfirmed uplink sending ...
08:55:11.330 -> Into send state
08:55:11.330 -> 
08:55:11.730 -> Voltage: 4206
08:55:11.730 -> Humidity: 54.75%  Temperature: 24.31°C  Pressure: 1004.92hPa 
08:55:11.783 -> AppDataSize: 18 AppData: 0 0 9 127 21 99 0 0 0 0 0 0 0 0 136 139 16 110 .
08:55:11.783 -> unconfirmed uplink sending ...
08:56:12.125 -> Into send state
08:56:12.125 -> 
08:56:12.573 -> Voltage: 4208
08:56:12.573 -> Humidity: 55.34%  Temperature: 24.37°C  Pressure: 1004.91hPa 
08:56:12.573 -> AppDataSize: 18 AppData: 0 0 9 133 21 158 0 0 0 0 0 0 0 0 136 138 16 112 .
08:56:12.573 -> unconfirmed uplink sending ...

I checked the gateway console. There is no join message. Instead the frame counter is increased to 65535 (so it turns to 0 with the next message):

grafik
grafik.png1718×1290 231 KB

(please ignore the one message from the other device)

Is this a bug that the frame counter is reset without a join?
Is there a workaround for this?
If necessary, I can provide my sketch.
Thank you very much

#2

I’m one step further: In my setup I call LoRaWAN.ifskipjoin() as in the example https://github.com/HelTecAutomation/CubeCell-Arduino/blob/master/libraries/LoRa/examples/LoRaWAN/LoRaWan/LoRaWan.ino .

void setup() {
  Serial.begin(115200);
  uint64_t chipID=getID();
  Serial.printf("ChipID:%04X%08X\r\n",(uint32_t)(chipID>>32),(uint32_t)chipID); 
  rainWoke = false;
#if(AT_SUPPORT)
  enableAt();
#endif
  deviceState = DEVICE_STATE_INIT;
  LoRaWAN.ifskipjoin();

  attachInterrupt();

  Serial.println("Starting watchdog");
  /* Enable the WDT, autofeed */
  innerWdtEnable(true);
}

When I remove the line, the join works.
So I guess it is some problem with LoRaWAN.ifskipjoin() not joining while the frame counter is reset nevertheless.
I remove the LoRaWAN.ifskipjoin() now and I’m fine with it for now.

#3

It is 16 bits, so it will be cleared when the maximum value is reached, which is normal.

#4

It is fine that it is rolling from 65535 to 0.
But why is it set to 65535 when I press the reset button (and call LoRaWAN.ifskipjoin() ). Shouldn’t the counter stay at the number it was before?

#5

After resetting, it re-enters the network. So the counter will return to 0.