More mqtt info

ampel-firmware/mqtt.cpp

@@ -59,7 +59,7 @@ namespace mqtt {
   }
 
   void publish(const char *timestamp, int16_t co2, float temperature, float humidity) {
-    if (WiFi.status() == WL_CONNECTED && mqttClient.connected()) {
+    if (wifi::connected() && mqttClient.connected()) {
       led_effects::onBoardLEDOn();
       Serial.print(F("MQTT - Publishing message ... "));
 
@@ -105,7 +105,7 @@ namespace mqtt {
       // It failed less than wait_after_fail ago. Not even trying.
       return;
     }
-    if (WiFi.status() != WL_CONNECTED) { //NOTE: Sadly, WiFi.status is sometimes WL_CONNECTED even though it's really not
+    if (!wifi::connected()) { //NOTE: Sadly, WiFi.status is sometimes WL_CONNECTED even though it's really not
       // No WIFI
       return;
     }
@@ -141,10 +141,23 @@ namespace mqtt {
       Serial.println(F(" Connected."));
       last_failed_at = 0;
     } else {
+      char const *mqtt_statuses[] = { // As defined in PubSubClient
+          "Connection timeout", // -4
+              "Connection lost",
+              "Connection failed",
+              "Disconnected",
+              "Connected!", // 0
+              "Bad protocol",
+              "Bad client ID",
+              "Unavailable",
+              "Bad credentials",
+              "Unauthorized" }; // 5
       last_failed_at = seconds();
-      Serial.print(F(" Failed! Error code="));
+      Serial.print(F(" Failed! "));
+      Serial.print(mqtt_statuses[mqttClient.state() + 4]);
+      Serial.print(" (Code=");
       Serial.print(mqttClient.state());
-      Serial.print(F(". Will try again in "));
+      Serial.print(F("). Will try again in "));
       Serial.print(config::wait_after_fail);
       Serial.println("s.");
     }
@@ -178,9 +191,9 @@ namespace mqtt {
     led_effects::showKITTWheel(color::green, 1);
   }
 
-  // It can be hard to find the local IP of a sensor if it isn't connected to Serial port, and if mDNS is disabled.
-  // If the sensor can be reach by MQTT, it can answer with info about local_ip and ssid.
-  // The sensor will send the info to "CO2sensors/ESP123456/info".
+// It can be hard to find the local IP of a sensor if it isn't connected to Serial port, and if mDNS is disabled.
+// If the sensor can be reach by MQTT, it can answer with info about local_ip and ssid.
+// The sensor will send the info to "CO2sensors/ESP123456/info".
   void sendInfoAboutLocalNetwork() {
     char info_topic[60]; // Should be enough for "CO2sensors/ESP123456/info"
     snprintf(info_topic, sizeof(info_topic), "%s/info", publish_topic);