Updated main.py to be more failsafe. Now using umqtt.robust too.

main.py

@@ -4,7 +4,7 @@ import time
 import json
 import machine
 from machine import Pin
-from umqtt.simple import MQTTClient
+from umqtt.robust import MQTTClient
 import dht
 import urequests
 import wifi_config
@@ -115,7 +115,10 @@ def main():
     wlan = network.WLAN(network.STA_IF)
     
     # Create MQTT Client
-    mqtt_client = MQTTClient(mqtt_config.MQTT_CLIENT_ID, mqtt_config.MQTT_HOST_NAME)
+    mqtt_client = MQTTClient(
+        client_id = mqtt_config.MQTT_CLIENT_ID,
+        server = mqtt_config.MQTT_HOST_NAME,
+        )
 
     # Create DHT22
     sensor = dht.DHT22(Pin(DHT_22_GPIO_PIN))
@@ -132,7 +135,28 @@ def main():
         if DEBUG:
             print(f'\nStarting loop #{count}... \nWiFI Status is {wlan.status()}.')
         
+        # Create Local Flags for Control
+        wifi_ready = False
+        mqtt_ready = False
+        dht22_ready = False
+
+        # DHT22 and CPU Reading.
+        try:
+            # CPU Reading.
+            cpu_temp = read_cpu_temp()
+
+            # DHT22 Reading.
+            dht22_reading = read_dht_22(sensor)
+            #debug_str = "None"
+            if dht22_reading is not None:
+                temp,hum = dht22_reading
+                temp = temp * 9/5. + 32.0
+                dht22_ready = True
+        except:
+            continue
+
         # WiFi Connection.
+        try:
             if wlan.status() != 3:
                 ifconfig = wlan_up(wlan)
                 if ifconfig is None:
@@ -142,16 +166,22 @@ def main():
                     time.sleep(10)
                     continue
                 else:
+                    wifi_ready = True
                     if DEBUG:
                         print("Connected to WiFi: {}".format(ifconfig))
             else:
+                wifi_ready = True
                 ifconfig = wlan.ifconfig()
                 if DEBUG:
                     print(f"Skipping WiFi Activation since WiFi Status is {wlan.status()} \n{ifconfig}.")
+        except:
+            continue
 
         # MQTT Conneciton.
         try:
-            mqtt_client.connect()
+            try:
+                mqtt_client.connect(clean_session = False)
+                mqtt_ready = True
                 if DEBUG:
                     print(f'MQTT Connected.')
             
@@ -161,17 +191,12 @@ def main():
                 led_error_code(led, 2)
                 time.sleep(5)
                 continue # Start back at the top of the While Loop        
+        except:
+            continue
 
-        # DHT22 Reading.
+        # Ready to Publish?
-        dht22_reading = read_dht_22(sensor)
+        try:
-        #debug_str = "None"
+            if wifi_ready and mqtt_ready and dht22_ready:
-        if dht22_reading is not None:
-            temp,hum = dht22_reading
-            temp = temp * 9/5. + 32.0
-            
-        # CPU Reading.
-        cpu_temp = read_cpu_temp()
-        
                 # Timestamp
                 time_now = time.localtime()
                 timestamp = "{}/{}/{} {}:{}:{}".format(time_now[1],time_now[2],time_now[0],time_now[3],time_now[4],time_now[5])
@@ -200,6 +225,9 @@ def main():
                 if DEBUG:
                     print(f'MQTT Disconnected.')
 
+        except:
+            continue
+
         # Sleep for a bit.
         if DEBUG:
             print(f'Finished loop #{count}.')