This code looks wrong:

  command = malloc(26);
  command = "AT+CIPSSEND";
  strcat(command, number);
  strcat(command, ",");
  strcat(command, length_of_payload);
  send_wlan_chip_command(command);

First you allocate 26 bytes, than a new string is created, which you strcat to it. This happens in memory that is not allocated (or overwrites other data).

Instead of

  command = "AT+CIPSSEND";

use

  strcpy(command, "AT+CIPSSEND";

Also check if 26 bytes is enough, make it 128 to be sure (later check the correct amount you need).

This code looks wrong:

  command = malloc(26);
  command = "AT+CIPSSEND";
  strcat(command, number);
  strcat(command, ",");
  strcat(command, length_of_payload);
  send_wlan_chip_command(command);

First you allocate 26 bytes, then a new string is created, which you strcat to it. This happens in memory that is not allocated (or overwrites other data).

Instead of

  command = "AT+CIPSSEND";

use

  strcpy(command, "AT+CIPSSEND");

Also check that 26 bytes is enough, change it to 128 bytes to be sure (check the correct amount you need later).

This code looks suspicious:

  command = malloc(26);
  command = "AT+CIPSSEND";
  strcat(command, number);
  strcat(command, ",");
  strcat(command, length_of_payload);
  send_wlan_chip_command(command);

First you allocate 26 bytes, than a new string is created, which you strcat to it. This happens in memory that is not allocated (or overwrites other data).

Instead of

  command = "AT+CIPSSEND";

use

  strcat(command, "AT+CIPSSEND";

Also check if 26 bytes is enough, make it 128 to be sure (later check the correct amount you need).

This code looks wrong:

  command = malloc(26);
  command = "AT+CIPSSEND";
  strcat(command, number);
  strcat(command, ",");
  strcat(command, length_of_payload);
  send_wlan_chip_command(command);

First you allocate 26 bytes, than a new string is created, which you strcat to it. This happens in memory that is not allocated (or overwrites other data).

Instead of

  command = "AT+CIPSSEND";

use

  strcpy(command, "AT+CIPSSEND";

Also check if 26 bytes is enough, make it 128 to be sure (later check the correct amount you need).