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28	28	= 2.  Firmware Change Log for MQTT feature =
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41	41	= 3.  MQTT forward operating principle =
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47	47	Below shows the network structure for MQTT forwarding.
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49	49	* **For Uplink:**  The sensor sends data to LoRa Gateway via LoRa wireless, The gateway will process these data and forward to remote MQTT Broker via Internet.
50		-* **For Downlink:** The gateway subscribe a topic in the MQTT broker, when there is update on the topic, the gateway will know and broadcast the data to Local LoRa network,
	48	+* **For Downlink:** The gateway subscribe a topic in the MQTT broker, when there is update on the topic, the gateway will know and broadcast the data to Local LoRa network.
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52	52	[[image:image-20220527133547-1.png]]
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54	54	General MQTT structure
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57	57	== 3.2  How sensor data is forwarded ==
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63	63	=== 3.2.1  Upstream ===
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65	65	Assume there are two sensor nodes, their ID are Node1 ID: 6734 , Node2 ID: 7456. In the remote MQTT broker there are two topics: Topic1: /channel/765800, Topic2: /channel/367860. We can set up in the gateway to map Node1 to Topic1 and Node2 to Topic2. So when there is a sensor data from Node1, the gateway will forward the data to Topic1, when there is sensor data from Node2, the gateway will forward to Topic2.
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68	68	The data flow works as below diagram.
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69	69	)))
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71	71	[[image:image-20220527134000-2.png]]
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98	98	Downstream path
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101	101	== 3.3  Macro Definition ==
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107	107	Currently the (% style="color:#4f81bd" %)**-t (topic)**(%%) and (% style="color:#4f81bd" %)**-m (message)**(%%) support Macros.
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118	118	* USERNAME: User ID (-u)
119	119	* HOSTNAME: Device Hostname
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121	121	=== 3.3.2  -m message macro ===
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127	127	* META: Completely sensor data with time stamp and rssi
128	128	* JSON: Convert META to json format.
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130	130	=== 3.3.3  Example for Macro ===
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322	322	== 4.3  Simulate via Dragino Command Line ==
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324	324	For first try of MQTT connection, simulate via command line is recommend, there are many servers / connection type for MQTT. They are using different connection parameters. Simulating the connection via command line will help us rapidly connect to server and debug.
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326	326	In the Dragino Gateway, we use [[mosquitto client>>url:https://mosquitto.org/]] for MQTT connection.
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349	349	mosquitto_sub
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352	352	== 4.4  Configure Dragino UI for MQTT connection ==
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354	354	This chapter are step by step to show to configure the Dragino Menu for MQTT auto connection.
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515	515	When use test this feature, please use the version higher then : (% style="color:#4f81bd" %)**LG02_LG08~-~-build-v5.4.1593400722-20200629-1120**(%%), in this version, the upload format is changed and readable, which is easier for integration.
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518		-(% style="color:#4f81bd" %)**Video Instruction**(%%): (% style="color:blue" %)[[https:~~/~~/youtu.be/qJTY441-t90>>url:https://youtu.be/qJTY441-t90]]
	530	+(% style="color:blue" %)**Video Instruction**(%%): (% style="color:blue" %)[[https:~~/~~/youtu.be/qJTY441-t90>>url:https://youtu.be/qJTY441-t90]]
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522		-(% style="color:blued" %)**Step 1**(%%): Refer [[Communicate with ABP End Node>>Communicate with ABP End Node without LoRaWAN Network Server --- LG308]] to know how to set up LG308 to work with LoRaWAN End node.
	534	+(% style="color:blue" %)**Step 1**(%%): Refer [[Communicate with ABP End Node>>Communicate with ABP End Node without LoRaWAN Network Server --- LG308]] to know how to set up LG308 to work with LoRaWAN End node.
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