Remove auto erase function (#632)

* Remove auto erase function
* add docs

docs/use/boards.md

@@ -1,6 +1,10 @@
 # Boards
 
-## ESP32
+## ESP
+
+### Erasing the flash
+
+So as to erase the flash memory on ESP boards you may do a long press to TRIGGER_GPIO button or connect the pin to the ground.
 
 ### Low power mode for ESP32
 OpenMQTTGateway support a low power mode for ESP32, this mode can be set by MQTT on a barebone ESP32:
@@ -56,4 +60,11 @@ OpenMQTTGateway support a low power mode for ESP32, this mode can be set by MQTT
 
 `mosquitto_pub -t "home/OpenMQTTGateway/commands/MQTTtoBT/config" -m '{"low_power_mode":2}'`
 
-The low power mode can be changed also with a push to button B when the board is processing (top button on M5stickC and middle button of M5stack).
+The low power mode can be changed also with a push to button B when the board is processing (top button on M5stickC and middle button of M5stack).
+
+### Erasing the flash
+
+So as to erase the flash memory on M5Stack boards you may do a long press to TRIGGER_GPIO button:
+* Button B on M5StickC (GPIO 37)
+* Button C on M5Stack (GPIO 37)
+* Button lateral on M5stick (GPIO 35)

main/main.ino

@@ -655,8 +655,7 @@ void disconnection_handling(int failure_number) {
   Log.warning(F("disconnection_handling, failed %d times" CR), failure_number);
   if (failure_number > maxConnectionRetry && !connectedOnce) {
 #  ifndef ESPWifiManualSetup
-    Log.error(F("Failed connecting 1st time to mqtt, reset wifi manager & erase network credentials" CR));
+    Log.error(F("Failed connecting 1st time to mqtt, you should put TRIGGER_GPIO to LOW or erase the flash" CR));
-    setup_wifimanager(true);
 #  endif
   } else if (failure_number <= maxConnectionRetry + ATTEMPTS_BEFORE_BG && connectedOnce) {
     Log.warning(F("Attempt to reinit wifi: %d" CR), wifiProtocol);