Converted MQTT publish to be JSON payloads.

main.py

@@ -1,6 +1,7 @@
 import network
 import rp2
 import time
+import json
 import machine
 from machine import Pin
 from umqtt.simple import MQTTClient
@@ -12,6 +13,9 @@ import mqtt_config
 # Change this GPIO PIN where your DHT22 sensor is connected
 DHT_22_GPIO_PIN = 3
 
+# Debug Mode
+DEBUG = False
+
 def read_cpu_temp():
     """
         If you print the value of the temperature value you are going to get an integer number between 0 and 65535.
@@ -55,6 +59,7 @@ def wlan_up(wlan):
         if wlan.status() < 0 or wlan.status() >= 3:
             break
         max_wait -= 1
+        if DEBUG:
             print('Waiting for WiFi connection...')
         time.sleep(1)
 
@@ -62,11 +67,13 @@ def wlan_up(wlan):
         return None
     
     ifconfig = wlan.ifconfig()
+    if DEBUG:
         print(ifconfig)
     return ifconfig
     
 def led_error_code(led, error_code: int):
     """Blink LED for a given error code (int). error code == number of times to blink"""
+    if DEBUG:
         print("LED Error Status code: {}".format(error_code))
     
     # Run a quick 'start error code sequence'
@@ -89,78 +96,108 @@ def led_error_code(led, error_code: int):
         blink_counter += 1
     # Make sure to turn off LED when this subroutine finished
     led.value(False)
+    if DEBUG:
         print("LED Error Status code finished for: {}".format(error_code))
     
     
 def main():
+
+    # Start Up Activities
+    if DEBUG:
         print("Start up")
     count = 0
+    led = machine.Pin('LED', machine.Pin.OUT)
+    led.value(False)
+    led_error_code(led, 1)
 
     # Set Wi-Fi Country
     rp2.country('US')
     wlan = network.WLAN(network.STA_IF)
     
+    # Create MQTT Client
     mqtt_client = MQTTClient(mqtt_config.MQTT_CLIENT_ID, mqtt_config.MQTT_HOST_NAME)
 
+    # Create DHT22
     sensor = dht.DHT22(Pin(DHT_22_GPIO_PIN))
     
-    led = machine.Pin('LED', machine.Pin.OUT)
+    # Let's Go!
-    led.value(False)
+    if DEBUG:
-    
-    led_error_code(led, 1)
-
         print("Enter main loop")
 
     while True:
 
+        # Loop Clean-Up and Prep
         led.value(False)
         count += 1
-        
+        if DEBUG:
             print(f'\nStarting loop #{count}... \nWiFI Status is {wlan.status()}.')
         
+        # WiFi Connection.
         if wlan.status() != 3:
             ifconfig = wlan_up(wlan)
             if ifconfig is None:
+                if DEBUG:
                     print("Trouble to connecting WiFi: {}".format(e))
                 led_error_code(led, 3)
                 continue
             else:
+                if DEBUG:
                     print("Connected to WiFi: {}".format(ifconfig))
         else:
             ifconfig = wlan.ifconfig()
+            if DEBUG:
                 print(f"Skipping WiFi Activation since WiFi Status is {wlan.status()} \n{ifconfig}.")
 
+        # MQTT Conneciton.
         try:
             mqtt_client.connect()
+            if DEBUG:
                 print(f'MQTT Connected.')
         
         except Exception as e:
+            if DEBUG:
                 print("Trouble to connecting to MQTT: {}".format(e))
             led_error_code(led, 2)
-            continue        
+            continue # Start back at the top of the While Loop        
 
+        # DHT22 Reading.
         dht22_reading = read_dht_22(sensor)
-        
+        #debug_str = "None"
-        debug_str = "None"
         if dht22_reading is not None:
             temp,hum = dht22_reading
             temp = temp * 9/5. + 32.0
-            mqtt_client.publish("m/v1/home/{}/0/temperature".format(mqtt_config.MQTT_ZONE_ID), "DHT22 Temp = {} degF".format(str(temp)), retain=True)
-            mqtt_client.publish("m/v1/home/{}/0/humidity".format(mqtt_config.MQTT_ZONE_ID),  "DHT22 %Hum = {} %".format(str(hum)), retain=True)
-            debug_str = "{} ; {}".format(temp, hum)
             
+        # CPU Reading.
         cpu_temp = read_cpu_temp()
         
-        print("{} ; CPU: {}".format(debug_str, 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])
         
-        # HW Info
+        # Build JSON Payloads
-        mqtt_client.publish("m/v1/hw/{}/cpu/temperature".format(mqtt_config.MQTT_HW_ID), "CPU Temp = {} degF".format(str(cpu_temp)), retain=True)
+        dht_data = {
-        mqtt_client.publish("m/v1/hw/{}/wlan/info".format(mqtt_config.MQTT_HW_ID), str(ifconfig), retain=True)
+            'Temperature':temp,
+            'Relative Humidity':hum,
+        }
+        dht_payload = json.dumps(dht_data)
+        
+        hw_data = {
+            'Timestamp':timestamp,
+            'CPU Temperature':cpu_temp,
+            'WiFi Information':ifconfig,
+        }
+        hw_payload = json.dumps(hw_data)
+        
+        # Publish
+        mqtt_client.publish("home/{}".format(mqtt_config.MQTT_ZONE_ID),dht_payload, retain=True)
+        mqtt_client.publish("hw/{}".format(mqtt_config.MQTT_HW_ID),hw_payload, retain=True)
 
         mqtt_client.disconnect()
+        if DEBUG:
             print(f'MQTT Disconnected.')
 
         # Sleep for a bit.
+        if DEBUG:
             print(f'Finished loop #{count}.')
         time.sleep(5)