Gunner
September 6, 2020, 8:53am
13
I adjusted your title (type of MCU can matter
Here is one of my examples of reconnection code, the basics should work with any MCU)… And there are many others in this forum, just search for reconnection, etc.
#9 Basic “Keeps running without WiFi or Blynk Server connection, but reconnects as soon as they are available” sketch
Simply does what the title says… Flashes the built in LED and sends UpTime data to both App and Serial monitor to show operation either way. Also has a lot of serial print commands to show general operation for troubleshooting… Remove them when you are comfortable that everything works for you.
http://docs.blynk.cc/#blynk-firmware-connection-management
#define BLYNK_PRINT Se…
As for actually resetting the MCU… the command ESP.restart();
opened 08:09PM - 28 Mar 18 UTC
closed 07:46AM - 15 Aug 19 UTC
Status: Stale
### Hardware:
Board: ESP32 DEV Board (DoIt)
Core Installation/update dat… e: Feb 15 2018
IDE name: eclipse
Flash Frequency: 40Mhz
Upload Speed: 115200
### Description:
Hi, I am having periodically issues with my wifi net. Sometimes my ESP32 looses it wifi connection:
`E (562420949) wifi: esp_wifi_disconnect 847 wifi not start`
I try a wifi connect in this case, if this doesn't help I intended to restart my ESP32, see loop () below.
My console log shows exactly one line
`Restart after XXX`
but the system did not restart.
Instead I get couple of lines like:
```
Task watchdog got triggered. The following tasks did not reset the watchdog in time:^M
- IDLE (CPU 0)^M
Tasks currently running:^M
CPU 0: wifi^M
CPU 1: IDLE^M
```
Is it possible that ESP.restart() is blocked by something (e.g. broken wifi connection) and that this just stops the loop() thread instead of the hole ESP32?
In some demo sketches I saw a delay(xxx) after the ESP.restart(). I didn't saw any reason for this and didn't include it. Am I missing something?
Best Regards
Michael
### Sketch:
...leaving out some additional code (e.g. MQTT handling stuff)
```
void MQTTLoop(void *pvParameters) {
while (1) {
if (pruefeAktion(&MQTTSubscriptionCheck,20)) subscribeMQTT();
if (WiFi.status() != WL_CONNECTED)
{
Serial.println("no WiFi! WiFiStatus:"+String(WiFi.status()));
WiFi.reconnect();
}
if (PSClient.connected())
{
PSClient.loop();
}
else {
debug(4,"loop", "no PSClient.loop()");
connectMQTT();
}
delay(500);
}
}
void setup() {
Serial.begin(115200);
Serial.println("Booting");
pinMode(LED1,OUTPUT);
digitalWrite(LED1,LOW);
WiFi.begin(ssid, password);
for (int i=0;i<100;i++)
{
if (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
else
break;
}
if (WiFi.status() == WL_CONNECTED)
{
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
else
Serial.println("keine WiFi Verbindung erhalten.");
Serial.println("Ready");
xTaskCreate( DebugLoop, "DEBUG", 4096,NULL,10,NULL);
PSClient.setClient(MQTTclient);
int MQTT_Port = (int) strtol(mqtt_port,NULL,10);
PSClient.setServer(mqtt_server,MQTT_Port);
PSClient.setCallback(MQTTcallback);
if (connectMQTT())
{
Serial.println("MQTT connect erfolgreich");
}
else
{
Serial.println("MQTT connect fehlgeschlagen");
}
xTaskCreate( MQTTLoop, "MQTT", 4096,NULL,10,NULL);
xTaskCreate( LEDLoop, "LED", 4096,NULL,10,NULL);
xTaskCreate( MonitorLoop, "Monitor", 4096,NULL,10,NULL);
//Subscriptions initial erstellen
subscribeMQTT();
debug(1,"setup","started.");
}
void loop() {
uint32_t Uptime = millis();
if (WiFi.status() != WL_CONNECTED)
WiFi.reconnect();
if (WiFi.status() != WL_CONNECTED && (Uptime > 1000* 60*5))
{
debug(1,"loop","Restart after "+ String(Uptime));
ESP.restart();
}
ArduinoOTA.handle();
delay (200);
}
```
).