gistfile1.c

static numvar meshSetKey(void) {
  if (!checkArgs(1, F("usage: mesh.setkey(\"key\")"))) {
    return 0;
  }
  char key[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
  strncpy(key, (const char*)getstringarg(1), 16);
  key[strlen((const char*)getstringarg(1))] = 0xFF; // remove null termination char
  Scout.meshSetSecurityKey((const uint8_t *)key);
  return 1;
}