Esp32 serial1 problem

Projects Programming
1

i try to communicate with GSM module via serial1 (txd1 rxd1)

when i run this code i dont get the replay i just see

GSM_replay:

so i dont see anything from

Serial.println(cmd);


int test(){
  error_ms=millis();
  Serial1.println("AT");
  
  while (true) {//wait for replay
    if (Serial1.available() > 0) {
      String cmd = Serial1.readString();
      Serial.print("GSM_replay:");
      Serial.println(cmd);

      if (cmd.startsWith(replay_cmd)) {
        return 1;
      }
    }

    if (millis() - error_ms > 10000) {  
      return 0;
    }

  }
}
2

The code is incomplete, it does not compile.

3

We need to see all the code because we can't guess what you've typed (e.g. I saw you delete a trim_msg() function call in the code snippet you show us).

Regards

4

code is big and is for other things also, i try to write here simple so i can show just problem

example if device replay

OK

+QMTOPEN: 0,0

i see just

GSM_replay:
GSM_replay:OK

i never get the
> +QMTOPEN: 0,0

5

So you don't have a communication problem, you have a code problem.

Good luck!

1 Like
6

good luck

7

Without enough information I cannot solve the problem. I would guess you do not have an annotated schematic either. Without the needed information Good Luck!

8

Post an MRE. This is the smallest, complete code that compiles and demonstrates the issue at hand.

9

One possibility is that the GSM is replying, but the conditions of your read are not correct so the program doesn't receive it. If there isn't one already put a led (and resistor) on the gsm->esp line.

10

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