Reliable MQTT implementation.
This commit is contained in:
marcel
@@ -35,52 +35,53 @@ from paho.mqtt.properties import Properties
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from paho.mqtt.packettypes import PacketTypes
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properties=Properties(PacketTypes.PUBLISH)
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properties.MessageExpiryInterval=30 # in seconds
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import ssl
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#import ssl
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version = '3' # or '5'
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mqtt_transport = 'tcp' # or 'websockets'
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def start_mqtt(config):
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if version == '5':
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client = mqtt.Client(CallbackAPIVersion.VERSION2, client_id="myPy",
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transport=mqtt_transport,
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protocol=mqtt.MQTTv5)
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if version == '3':
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client = mqtt.Client(CallbackAPIVersion.VERSION2, client_id="myPy",
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transport=mqtt_transport,
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protocol=mqtt.MQTTv311,
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clean_session=True)
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#client.username_pw_set("user", "password")
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version = '3' # or '5'
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mqtt_transport = 'tcp' # or 'websockets'
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import mqtt_callbacks
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client.on_message = mqtt_callbacks.on_message;
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client.on_connect = mqtt_callbacks.on_connect;
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#client.on_publish = mqtt_callbacks.on_publish;
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client.on_subscribe = mqtt_callbacks.on_subscribe;
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if version == '5':
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client = mqtt.Client(CallbackAPIVersion.VERSION2, client_id="myPy",
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transport=mqtt_transport,
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protocol=mqtt.MQTTv5)
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if version == '3':
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client = mqtt.Client(CallbackAPIVersion.VERSION2, client_id="myPy",
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transport=mqtt_transport,
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protocol=mqtt.MQTTv311,
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clean_session=True)
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#client.username_pw_set("user", "password")
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mqtt_broker = 'mqtt.meezenest.nl'
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mqtt_port = 1883
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mqtt_keepalalive=60
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mqtt_topic = 'topic/important'
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import mqtt_callbacks
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client.on_message = mqtt_callbacks.on_message;
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client.on_connect = mqtt_callbacks.on_connect;
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#client.on_publish = mqtt_callbacks.on_publish;
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client.on_subscribe = mqtt_callbacks.on_subscribe;
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if version == '5':
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from paho.mqtt.properties import Properties
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from paho.mqtt.packettypes import PacketTypes
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properties=Properties(PacketTypes.CONNECT)
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properties.SessionExpiryInterval=30*60 # in seconds
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client.connect(mqtt_broker,
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port=mqtt_port,
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clean_start=mqtt.MQTT_CLEAN_START_FIRST_ONLY,
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properties=properties,
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keepalive=60);
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elif version == '3':
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client.connect(mqtt_broker, port=mqtt_port, keepalive=mqtt_keepalalive);
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if version == '5':
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from paho.mqtt.properties import Properties
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from paho.mqtt.packettypes import PacketTypes
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properties=Properties(PacketTypes.CONNECT)
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properties.SessionExpiryInterval=30*60 # in seconds
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client.connect(config['mqtt-server'],
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port=config['mqtt-port'],
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clean_start=mqtt.MQTT_CLEAN_START_FIRST_ONLY,
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properties=properties,
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keepalive=60);
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client.loop_start();
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elif version == '3':
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client.connect(config['mqtt-server'], port=config['mqtt-port'], keepalive=60);
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while 1:
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client.publish(mqtt_topic,'Cedalo Mosquitto is awesome',2,properties=properties);
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time.sleep(1)
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client.loop_start();
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# Debug code
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# while 1:
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# client.publish(mqtt_topic,'Cedalo Mosquitto is awesome',2,properties=properties);
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# time.sleep(1)
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return client
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def setup():
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@@ -118,6 +119,20 @@ def setup():
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logging.info("Using RS485 port : " + configuration.config_file_settings['modbus']['port'])
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logging.info("Publishing sensor data on MQTT broker: " + configuration.config_file_settings['global']['mqtt-server'])
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# Start MQTT section
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mqtt_connected = False
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while not mqtt_connected:
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try:
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mqtt_client = start_mqtt(configuration.config_file_settings['global'])
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mqtt_connected = True
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except:
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logging.error("Could not connect to MQTT broker. Retry until success (of until CTRL-C is pressed).")
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time.sleep(3) # Sleep for 3 seconds
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# End MQTT section
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# Start ModBus section
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# Read the ModBus definition file
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modbus_registers = definition_file_reader(definition_file)
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@@ -139,7 +154,9 @@ def setup():
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logging.error("Could not open serial port " + configuration.config_file_settings['modbus']['port'])
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sys.exit("Exiting")
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return configuration, controller, modbus_addresses, modbus_registers
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# End ModBus section
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return configuration, controller, modbus_addresses, modbus_registers, mqtt_client
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def data_logger(data, configuration):
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@@ -189,23 +206,46 @@ def send_data_to_aprs(weather_data, configuration):
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logging.error(f"Command returned: {e}")
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def send_data_to_mqtt(data, configuration, modbus_registers):
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def send_data_to_mqtt(data, configuration, modbus_registers, mqtt_client):
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mqtt_top_topic = []
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mqtt_full_topic = []
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#logging.debug(modbus_registers)
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# Match actual device on ModBus with definition in modbus_registers.yaml
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for index1, entry1 in enumerate(modbus_registers['devices']):
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if entry1['device_type'] == data['Type']:
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# Format serial number for unique MQTT ID
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logging.debug("topic: mees_electronics_" + hex(data['ID'][0])[2:].zfill(4) + hex(data['ID'][1])[2:].zfill(4) + hex(data['ID'][2])[2:].zfill(4) + hex(data['ID'][3])[2:].zfill(4))
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logging.debug("type: " + str(data['Type']))
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logging.debug("type_string: " + data['TypeString'])
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mqtt_type_topic = hex(data['ID'][0])[2:].zfill(4) + hex(data['ID'][1])[2:].zfill(4) + hex(data['ID'][2])[2:].zfill(4) + hex(data['ID'][3])[2:].zfill(4)
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mqtt_top_topic = configuration.config_file_settings['global']['mqtt-root-topic'] + "/" + mqtt_type_topic + "/"
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message_topic = "id"
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mqtt_message = "mees_electronics_" + mqtt_type_topic
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mqtt_full_topic = mqtt_top_topic + message_topic
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MqttClient.publish(mqtt_full_topic, mqtt_message, 2, properties = properties);
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logging.debug("Published message to MQTT broker: " + mqtt_full_topic + " = " + mqtt_message)
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message_topic = "type"
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mqtt_message = str(data['Type'])
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mqtt_full_topic = mqtt_top_topic + message_topic
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MqttClient.publish(mqtt_full_topic, mqtt_message, 2, properties = properties);
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logging.debug("Published message to MQTT broker: " + mqtt_full_topic + " = " + mqtt_message)
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message_topic = "type_string"
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mqtt_message = data['TypeString']
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mqtt_full_topic = mqtt_top_topic + message_topic
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MqttClient.publish(mqtt_full_topic, mqtt_message, 2, properties = properties);
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logging.debug("Published message to MQTT broker: " + mqtt_full_topic + " = " + mqtt_message)
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# Go through every input register and match the unit and description with the value
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for index2, entry2 in enumerate(data['InputRegisters']):
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print(entry1['input_register_names'][index2][2])
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# Scale values
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entry2 = entry2/ (10^entry1['input_register_names'][index2][2])
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logging.debug(entry1['input_register_names'][index2][0] + ": " + str(round(entry2,1)) + entry1['input_register_names'][index2][1])
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message_topic = entry1['input_register_names'][index2][0]
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mqtt_message = str(round(entry2,1))
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mqtt_full_topic = mqtt_top_topic + message_topic
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MqttClient.publish(mqtt_full_topic, mqtt_message, 2, properties = properties);
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logging.debug("Published message to MQTT broker: " + mqtt_full_topic + " = " + mqtt_message)
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logging.debug("Send data to MQTT broker.")
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@@ -225,13 +265,14 @@ def ReconnectModBus(configuration):
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logging.info("Reconnected to ModBus dongle.")
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Configuration, Controller, ModbusAddresses, ModbusRegisters = setup()
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Configuration, Controller, ModbusAddresses, ModbusRegisters, MqttClient = setup()
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LoopCounter = 0
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while (1):
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time.sleep(3) # Sleep for 3 seconds
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# Send APRS telemetry every 10 cycles = every 10 minutes
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'''
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LoopCounter = LoopCounter + 1
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if LoopCounter >= 1:
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@@ -242,7 +283,7 @@ while (1):
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time.sleep(3)
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LoopCounter = 0
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'''
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ModBusData={}
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# Loop through all configured ModBus devices and try to read the sensor data
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@@ -299,6 +340,6 @@ while (1):
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data_logger(ModBusData, Configuration)
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# Send sensor data to MQTT broker
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send_data_to_mqtt(ModBusData, Configuration, ModbusRegisters.definition_file_data)
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send_data_to_mqtt(ModBusData, Configuration, ModbusRegisters.definition_file_data, MqttClient)
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