check for Wifi availability before trying to connect to mqtt server

ernstkl · Aug 9, 2021 · d861ead · d861ead
1 parent 3c77d4f
commit d861ead
Showing 1 changed file with 11 additions and 1 deletion.
diff --git a/arduino/samd/libraries/CO2-Ampel/examples/CO2-Ampel/CO2-Ampel.ino b/arduino/samd/libraries/CO2-Ampel/examples/CO2-Ampel/CO2-Ampel.ino
@@ -364,11 +364,21 @@ void show_data(void) //Daten anzeigen
 void send_data_mqtt(void) // Daten auf mqtt-topic senden: tele/co2/<ab-cd>
 //TODO Ausführung des Codes schaltbar machen über Ampel-Webseite (2 Buttons)
 {
-  if (settings.mqtt_server[0] == 0) {
+  if (settings.mqtt_server[0] == 0) 
+  {
     // not configured
     return;
   }
 
+  if ((WiFi.status() == WL_CONNECT_FAILED) ||
+     (WiFi.status() == WL_CONNECTION_LOST) || 
+     (WiFi.status() == WL_DISCONNECTED))
+  { 
+    Serial.println("mqtt: no Wifi");
+    return;
+  }
+
+
   if (!mqtt_client.connected()) 
   {
     // connect or reconnect - timeout is 20s, even with mqtt_client.setSocketTimeout(2)