M410 LTE Antenna Detection - AT command

Firmware
1

This would be cool to have to determine if the antenna was installed correctly for production.

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2

It’s possible that some of these commands will be added to system firmware in future, but there’s nothing preventing your from using Cellular.command now. I don’t see any reason why that command shouldn’t work with Cellular.command. I’d try it and see if it works.

3

@rickkas7

int callbackAntenna(int type, const char* buf, int len, char* response) {
  Serial.println(".......buf_begin......");
  Serial.println(buf);
  Serial.println(".......buf_end......");
      if (sscanf(buf, "\r\n+UANTR: 0,%[^\r]", response) == 1);

    return WAIT;
}

Serial.println("Detecting Antenna: ");
          char response[200] = "";
          //int code = Cellular.command(callbackAntenna, response, 10000, "AT+UANTR=0\r\n");
          if (RESP_OK == Cellular.command(callbackAntenna, response, 10000, "AT+UANTR=0\r\n")) {
            Serial.printlnf("Antenna = %s\r\n", response);
          } else {
            Serial.println("error");
          }

This is the output, so the -1 indicates an open circuit although I have an antenna installed.

But there is an output of 4. Do you know what this number is or where its coming from? Each time I call this function the number 4 changes at each call between numbers 0 and 15.

Also do you know why the buf is printing out twice (between buf begin and buf end)?

Detecting Antenna: 
.......buf_begin......

+UANTR: 0,-1
4
.......buf_end......
.......buf_begin......

OK
TR: 0,-1
4
.......buf_end......
Antenna = 0,-1
4

Oh, wait, there’s going to be a different problem. This won’t work with the stock antenna.

The FXUB63 does not have a diagnostic resistor. There are specific models like this one that do, but most don’t.

The buf passed to the callback is not null terminated - it’s specified by length so the extra bytes are typically data that was left in the buffer from earlier.

3 Likes