RAK3172 Class C

LPWAN Modules / EVBs RAK3172
1

I am testing Lorawan class C in RUI interface for Rak3172. However, I could not set the sending period. In Class A, I was sleeping during OTAA_PERIOD. I won’t put it to sleep in Class C, but I couldn’t figure out how to solve it. Can you help me? I would be very happy if you could give an example code of class C otaa.

2

LoRaWAN Class C means the LoRa transceiver is in RX mode all the time. You cannot get low power current when using Class C.
The lowest I can get in Class C is around 6mA. This is consumed by the LoRa transceiver. The STM32WLE5 will still go into low power mode, but you will not see it in the power consumption.

3

I understood yes. I don’t need low power consumption right now, I just want to set a transmission period in class c mode. I will be sending downlink data from the AWS cloud system. Can’t uplink be done periodically in Class C? I just want sample code. Thank you @beegee

4

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I thought of something like this at first, but I saw that it didn’t work.

5

Of course timed uplinks are possible in all LoRaWAN classes.

The problem in your code is that you define last inside the loop(), which means it is initialized to 0 every time loop() is called, so your criteria is never fulfilled.

Move the definition outside of loop().
And your if looks weird I would never write it like this.

static uint64_t last = 0;

void setup()
{
   //  usual setup stuff
   last = millis():
}

void loop(void)
{
   if ((millis() - last) > OTAA_PERIOD)
   {
      uplink_routine();
      last = millis();
   }
}

Or more elegant, use a RUI3 timer, like in this example RUI3-LowPower-Example

1 Like
6

Thank you for your help @beegee