Changes for page MQTT Forward Instruction

Last modified by Xiaoling on 2025/07/31 16:59

From 1.16 to 1.15 From 37.13 to 37.12

From version 37.12

edited by Xiaoling
on 2022/06/01 10:45

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To version 1.16

edited by Xiaoling
on 2022/05/12 16:15

Change comment: There is no comment for this version

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@@ -7,13 +7,12 @@
  Dragino LoRa/LoRaWAN gateway support MQTT forwarding. It can forward the sensor data from LoRa network to MQTT server , and vice verse.
--
  == 1.1 Support Devices ==
  This MQTT forward instruction is for below devices:
  * Firmware Version > LG02_LG08-5.3.1580178039 [[Firmware Download>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/Release/]]
--* LG01N, OLG01N ((% style="color:red" %)**Warning**(%%): LG01-P LG01-S use another instruction: [[MQTT for LG01-P/LG01S>>doc:Through MQTT to upload data.WebHome]])
++* LG01N, OLG01N ((% class="mark" %)**Warning**(%%): LG01-P LG01-S use another instruction: [[MQTT for LG01-P/LG01S>>url:https://wiki.dragino.com/index.php/Through_MQTT_to_upload_data]])
  * LG02, OLG02
  * LG308, DLOS8
  * LPS8
@@ -21,7 +21,6 @@
  * MS14 series if installed with the same firmware. (in this case, the MQTT forward will work , but no LoRa support)
--
  = 2. Firmware Change Log for MQTT feature =
  (((
@@ -32,7 +32,6 @@
  ** Initiate version
--
  = 3. MQTT forward operating principle =
  == 3.1 Network Structure ==
@@ -42,7 +42,7 @@
  * 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.
  * 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,
--[[image:image-20220527133547-1.png]]
++[[image:https://wiki.dragino.com/images/thumb/4/45/MQTT_Forward_1.png/600px-MQTT_Forward_1.png||height="348" width="600"]]
  General MQTT structure
@@ -60,7 +60,7 @@
  The data flow works as below diagram.
  )))
--[[image:image-20220527134000-2.png]]
++[[~[~[image:https://wiki.dragino.com/images/thumb/2/2a/MQTT_Forward_2.png/600px-MQTT_Forward_2.png~|~|height="355" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:MQTT_Forward_2.png]]
  (((
  Upstream path
@@ -82,7 +82,7 @@
  Below are the data flow for downstream.
  )))
--[[image:image-20220527134038-3.png]]
++[[image:https://wiki.dragino.com/images/thumb/3/3a/MQTT_Forward_3.png/600px-MQTT_Forward_3.png||height="368" width="600"]]
  Downstream path
@@ -92,9 +92,7 @@
  The MQTT publish command use Macro settings to generate flexible upstream payload for MQTT publish.
  (((
--Currently the (% style="color:#4f81bd" %)**-t (topic)**(%%) and (% style="color:#4f81bd" %)**-m (message)**(%%) support Macros.
--
--
++Currently the (% class="mark" %)**-t (topic)**(%%) and (% class="mark" %)**-m (message)**(%%) support Macros.
  )))
  === 3.3.1 -t topic macro ===
@@ -105,8 +105,6 @@
  * USERNAME: User ID (-u)
  * HOSTNAME: Device Hostname
--
--
  === 3.3.2 -m message macro ===
  * HOSTNAME: Device Hostname
@@ -115,15 +115,12 @@
  * META: Completely sensor data with time stamp and rssi
  * JSON: Convert META to json format.
--
--
  === 3.3.3 Example for Macro ===
--[[image:image-20220527134251-4.png]]
++[[image:https://wiki.dragino.com/images/thumb/c/c7/MQTT_Command_9.png/600px-MQTT_Command_9.png||height="385" width="600"]]
  MQTT Publish configure
--
  Above screen shots shows below format:
  * -t: CLIENTID/CHANNEL/data
@@ -131,13 +131,12 @@
  When there is a LoRa sensor arrive. it will be store at the /var/iot/channels as below:
--[[image:image-20220527134332-5.png]]
++[[image:https://wiki.dragino.com/images/thumb/c/c4/MQTT_Command_20.png/600px-MQTT_Command_20.png||height="325" width="600"]]
  Sensor Data
--
  (((
--According to above macro. Gateway will publish (% style="color:#4f81bd" %)**field1=22.0&field2=49.0**(%%) to topic: (% style="color:#4f81bd" %)**dragino-1b7060/78901/data**(%%), where 78901 is the remote channel for this node ID.
++According to above macro. Gateway will publish (% class="mark" %)**field1=22.0&field2=49.0**(%%) to topic: (% class="mark" %)**dragino-1b7060/78901/data**(%%), where 78901 is the remote channel for this node ID.
  )))
@@ -150,7 +150,8 @@
  root@dragino-1ec39c:~~# mosquitto_pub ~-~-help
  mosquitto_pub is a simple mqtt client that will publish a message on a single topic and exit.
  mosquitto_pub version 1.6.4 running on libmosquitto 1.6.4.
--\\Usage: mosquitto_pub {[-h host] [-p port] [-u username] [-P password] -t topic | -L URL}
++
++Usage: mosquitto_pub {[-h host] [-p port] [-u username] [-P password] -t topic | -L URL}
                       {-f file | -l | -n | -m message}
                       [-c] [-k keepalive] [-q qos] [-r] [~-~-repeat N] [~-~-repeat-delay time]
                       [-A bind_address]
@@ -168,7 +168,8 @@
                       [~-~-property command identifier value]
                       [-D command identifier value]
         mosquitto_pub ~-~-help
--\\-A : bind the outgoing socket to this host/ip address. Use to control which interface
++
++-A : bind the outgoing socket to this host/ip address. Use to control which interface
        the client communicates over.
  -d : enable debug messages.
  -D : Define MQTT v5 properties. See the documentation for more details.
@@ -196,7 +196,7 @@
  ~-~-help : display this message.
  ~-~-repeat : if publish mode is -f, -m, or -s, then repeat the publish N times.
  ~-~-repeat-delay : if using ~-~-repeat, wait time seconds between publishes. Defaults to 0.
--~-~-quiet : (% style="color:red" %)don't print error messages.
++~-~-quiet : (% class="mark" %)don't print error messages.
  ~-~-will-payload : payload for the client Will, which is sent by the broker in case of
                    unexpected disconnection. If not given and will-topic is set, a zero
                    length message will be sent.
@@ -224,7 +224,8 @@
  ~-~-proxy : SOCKS5 proxy URL of the form:
             socks5h:~/~/[username[:password]@]hostname[:port]
             Only "none" and "username" authentication is supported.
--\\See https:~/~/mosquitto.org/ for more information.
++
++See https:~/~/mosquitto.org/ for more information.
  )))
@@ -234,36 +234,43 @@
  (% class="box" %)
  (((
--//# Call MQTT Publish command
--\\# 1. Case with User, Password and Client ID present  (e.g. Azure)
++# Call MQTT Publish command
++
++# 1. Case with User, Password and Client ID present  (e.g. Azure)
  if [ ! -z "$pass" ] && [ ! -z "$user" ] && [ ! -z "$clientID" ]; then
  case="1"
  mosquitto_pub $D -h $server -p $port -q $pub_qos -i $clientID -t $pub_topic -u $user -P "$pass" $C $cafile $PUB_FLAG "$mqtt_data"
--\\# 2. Case with Certificate, Key and ClientID present (e.g. AWS)
++
++# 2. Case with Certificate, Key and ClientID present (e.g. AWS)
  elif [ ! -z "$certfile" ] && [ ! -z "$key" ] && [ ! -z "$clientID" ]; then
  case="2"
  mosquitto_pub $D -h $server -p $port -q $pub_qos -i $clientID -t $pub_topic ~-~-cert $cert ~-~-key $key $C $cafile $PUB_FLAG "$mqtt_data"
--\\# 3. Case with no User, Certificate or ClientID present
++
++# 3. Case with no User, Certificate or ClientID present
  elif [ -z "$user" ] && [ -z "$certfile" ] && [ -z "$clientID" ]; then
  case="3"
  mosquitto_pub $D -h $server -p $port -q $pub_qos -t $pub_topic $PUB_FLAG "$mqtt_data"
--\\# 4. Case with no User, Certificate, but with ClientID present
++
++# 4. Case with no User, Certificate, but with ClientID present
  elif [ -z "$user" ] && [ -z "$certfile" ] && [ ! -z "$clientID" ]; then
  case="4"
  mosquitto_pub $D -h $server -p $port -q $pub_qos -i $clientID -t $pub_topic $PUB_FLAG "$mqtt_data"
--\\# 5. Case with User and ClientID present, but no Password and no Certificate present
++
++# 5. Case with User and ClientID present, but no Password and no Certificate present
  elif [ -z "$pass" ] && [ -z "$certfile" ] && [ ! -z "$user" ] && [ ! -z "$clientID" ]; then
  case="5"
  mosquitto_pub $D -h $server -p $port -q $pub_qos -i $clientID -t $pub_topic -u $user $PUB_FLAG "$mqtt_data"
--\\# 6. Case with User and Password present, but no ClientID and no Certificate present
++
++# 6. Case with User and Password present, but no ClientID and no Certificate present
  elif [ ! -z "$user" ] && [ ! -z "$pass" ] && [ -z "$clientID" ] && [ -z "$certfile" ]; then
  case="6"
  mosquitto_pub $D -h $server -p $port -q $pub_qos  -t $pub_topic -u $user -P "$pass" $PUB_FLAG "$mqtt_data"
--\\# 0. Else - invalid parameters, just log
++
++# 0. Else - invalid parameters, just log
  else
--case="(% style="color:red" %)Invalid parameters" (%%)
--logger (% style="color:red" %)"[IoT.MQTT]:Invalid Parameters - mosquitto_pub not called."(%%)
--fi//
++case="Invalid parameters"
++logger "[IoT.MQTT]:Invalid Parameters - mosquitto_pub not called."
++fi
  )))
@@ -273,7 +273,6 @@
  This section is an example to show how to set up LG01-N to communicate with a MQTT server. The MQTT server is a simple utility set up in a local PC. Note: User can set up same server via [[this instruction>>url:http://www.steves-internet-guide.com/install-mosquitto-broker/]].
--
  == 4.2 Simulate via MQTT.fx utility ==
  The [[MQTT.fx>>url:http://mqttfx.jensd.de/index.php/download]] is a MQTT client tool. We can use this to simulate a MQTT connection to our MQTT broker first to make sure the MQTT broker works. This will also help us understand how it works.
@@ -282,21 +282,19 @@
  In this test, the MQTT broker and MQTT.fx are installed in the same PC, so the MQTT server address in MQTT.fx should be localhost. Below shows how to connect to the server.
  )))
--[[image:image-20220527134929-6.png]]
++[[image:https://wiki.dragino.com/images/thumb/0/06/MQTT_Forward_4.png/600px-MQTT_Forward_4.png||height="201" width="600"]]
  Connect to MQTT Broker
--
  After connected, use publish to public some thing to MQTT server. This to simulate upsteam
--[[image:image-20220527135037-7.png]]
++[[image:https://wiki.dragino.com/images/thumb/b/bd/MQTT_Forward_5.png/600px-MQTT_Forward_5.png||height="149" width="600"]]
  Upstream: Publish message to MQTT Broker
--
  To simulate a downstream, use MQTT.fx to subscribe a topic, and publish something to this topic. as Below:
--[[image:image-20220527135215-8.png]]
++[[image:https://wiki.dragino.com/images/thumb/3/3d/MQTT_Forward_6.png/600px-MQTT_Forward_6.png||height="279" width="600"]]
  Downstream: Subscribe a topic to get downstream
@@ -308,7 +308,7 @@
  In the Dragino Gateway, we use [[mosquitto client>>url:https://mosquitto.org/]] for MQTT connection.
--(% style="color:#4f81bd" %)**For Upstream**
++(% class="mark" %)**For Upstream**
  command is [[mosquitto_pub>>url:https://mosquitto.org/man/mosquitto_pub-1.html]]
@@ -316,16 +316,16 @@
  Note: 192.168.199.148 is MQTT broker address, the gateway and the MQTT broker PC are in the same network.
--[[image:image-20220527135310-9.png]]
++[[image:https://wiki.dragino.com/images/thumb/d/d0/MQTT_Command_6.png/600px-MQTT_Command_6.png||height="188" width="600"]]
  mosquitto_pub
--(% style="color:#4f81bd" %)**For Downstream**
++(% class="mark" %)**For Downstream**
  Use [[mosquitto_sub>>url:https://mosquitto.org/man/mosquitto_sub-1.html]] to subscribe the change on the topic.
--[[image:image-20220527135440-10.png]]
++[[image:https://wiki.dragino.com/images/thumb/8/89/MQTT_Command_7.png/600px-MQTT_Command_7.png||height="267" width="600"]]
  mosquitto_sub
@@ -335,7 +335,7 @@
  This chapter are step by step to show to configure the Dragino Menu for MQTT auto connection.
  (((
--Go to (% style="color:#4f81bd" %)**Dragino Menu ~-~-> MQTT Client**
++Go to (% class="mark" %)**Dragino Menu ~-~-> MQTT Client**
  )))
  [[image:https://wiki.dragino.com/images/thumb/b/bc/MQTT_Command_8.png/600px-MQTT_Command_8.png||height="249" width="600"]]
@@ -342,11 +342,9 @@
  go to mqtt configure menu
--(((
--Select (% style="color:#4f81bd" %)**Forward to MQTT server**. (% style="color:red" %)**Notice**(%%): This option is removed from the latest firmware, in the latest firmware, if user submit "SAVE & APPLY" in MQTT page, the gateway will use MQTT service.
--)))
++Select Forward to MQTT server. Notice: This option is removed from the latest firmware, in the latest firmware, if user submit "SAVE & APPLY" in MQTT page, the gateway will use MQTT service.
--[[image:image-20220527135742-11.png]]
++[[image:https://wiki.dragino.com/images/thumb/1/14/MQTT_Commands_8.png/600px-MQTT_Commands_8.png||height="240" width="600"]]
  forward to MQTT
@@ -355,44 +355,32 @@
  Below screenshot is same as the publish command:
--(% class="box" %)
--(((
--mosquitto_pub -h 192.168.199.148 -p 1883 -i dragino-1b7060 -t CLIENTID/CHANNEL/data -m DATA
--~/~/where the CLIENTID, CHANNEL & DATA are macro. represent for
--~/~/CLIENTID: dragino-1b7060
--~/~/CHANNEL: Remote ID in Channel settings; here is 78901 or 567456
--~/~/DATA: The data stores in /var/iot/channels/
--)))
++{{{mosquitto_pub -h 192.168.199.148 -p 1883 -i dragino-1b7060 -t CLIENTID/CHANNEL/data -m DATA
++//where the CLIENTID, CHANNEL & DATA are macro. represent for
++//CLIENTID: dragino-1b7060
++//CHANNEL: Remote ID in Channel settings; here is 78901 or 567456
++//DATA: The data stores in /var/iot/channels/
++}}}
--[[image:image-20220527135828-12.png]]
++[[image:https://wiki.dragino.com/images/thumb/c/c7/MQTT_Command_9.png/600px-MQTT_Command_9.png||height="385" width="600"]]
  MQTT Publish configure
++[[image:https://wiki.dragino.com/images/thumb/b/b7/MQTT_Command_10.png/600px-MQTT_Command_10.png||height="544" width="600"]]
--[[image:image-20220527135929-13.png]]
--
  MQTT Channel settings
--
--(((
  For example, if we put a data(temp=46) on the file /var/iot/channels/4567, because 4567 match the remote channel 78901. the gateway will run this command:
--)))
--(% class="box" %)
--(((
--mosquitto_pub -h 192.168.199.148 -p 1883 -i dragino-1b7060 -t dragino-1b7060/78901/data -m temp=46
--)))
++{{{mosquitto_pub -h 192.168.199.148 -p 1883 -i dragino-1b7060 -t dragino-1b7060/78901/data -m temp=46
++}}}
--(((
  to MQTT broker.
--)))
--(((
  Below is a simulation to put this data to active the MQTT publish.
--)))
--[[image:image-20220527140023-14.png]]
++[[image:https://wiki.dragino.com/images/thumb/3/30/MQTT_Command_11.png/600px-MQTT_Command_11.png||height="308" width="600"]]
  MQTT Publish
@@ -401,21 +401,17 @@
  Below screen shot equal to this subscribe command:
--(% class="box" %)
--(((
--mosquitto_sub -h 192.168.199.148 -p 1883 -i dragino-1b7060 -t command.
--)))
++{{{ mosquitto_sub -h 192.168.199.148 -p 1883 -i dragino-1b7060 -t command.
++}}}
--[[image:image-20220527140100-15.png]]
++[[image:https://wiki.dragino.com/images/3/36/MQTT_Command_12.png||height="173" width="579"]]
  MQTT Subscribe
--(((
  When MQTT broker receive a update on this topic, the gateway will get the update and use LoRa radio to broadcast this message. The LoRa parameters used for update is:
--)))
--[[image:image-20220527140148-16.png]]
++[[image:https://wiki.dragino.com/images/thumb/b/b8/MQTT_Command_13.png/600px-MQTT_Command_13.png||height="300" width="600"]]
  LoRa Broadcast parameters.
@@ -422,7 +422,7 @@
  And below is the subscribe simulation:
--[[image:image-20220527140238-17.png]]
++[[image:https://wiki.dragino.com/images/thumb/6/60/MQTT_Command_14.png/600px-MQTT_Command_14.png||height="255" width="600"]]
  downstream simulation
@@ -431,30 +431,21 @@
  In above section, we have configured the UI to support MQTT upstream and downstream. We can simulate via Linux command. In this section, we will guide how to communicate with remote LoRa End Node for upstream and downstream.
--
  === 4.5.1 Use LoRa Raw protocol for communication ~-~- For LG01/LG02 ===
--(((
  We can use [[LoRa Shield>>url:http://www.dragino.com/products/lora/item/102-lora-shield.html]] to send LoRa Raw data to Gateway and receive data from gateway.
--)))
--(((
  The example Sketch for LoRa Shield +Arduino is here: [[LoRa_Shield_Sketch_For_MQTT>>url:http://www.dragino.com/downloads/index.php?dir=LoraShield/]]
--)))
--(((
  And this link is the required library: [[arduino-LoRa-master>>url:http://www.dragino.com/downloads/index.php?dir=LoraShield/]]. Unzip this library and put in Arduino library location.
--)))
--(((
  What does the Arduino Sketch do? The Arduino Sketch will:
--)))
  * Upstream: Keep sending a LoRa Message every minutes with this payload : <4567>tem=xx&hum=yy (Where xx and yy are temperature and humidity value generated randomly).
  * Downstream: Listening broadcast message from gateway, and print it in console.
  * The LoRa parameter settings in Arduino should match the LoRa settings in gateway, as below:
--[[image:image-20220527140354-18.png]]
++[[image:https://wiki.dragino.com/images/thumb/3/3b/MQTT_Command_17.png/600px-MQTT_Command_17.png||height="197" width="600"]]
  LoRa Parameter should match
@@ -461,98 +461,114 @@
  Below is the test result after the Arduino Sketch is running.
--[[image:image-20220527140459-19.png]]
++[[image:https://wiki.dragino.com/images/thumb/6/63/MQTT_Command_18.png/600px-MQTT_Command_18.png||height="319" width="600"]]
  Upstream Data Flow
++[[image:https://wiki.dragino.com/images/thumb/1/18/MQTT_Command_19.png/600px-MQTT_Command_19.png||height="309" width="600"]]
--[[image:image-20220527140542-20.png]]
--
  Downstream Data Flow
  === 4.5.2 Use LoRaWAN Protocol for communication ~-~- For LG308/LPS8/DLOS8 ===
--(((
--Since firmware (% style="color:#4f81bd" %)**LG02_LG08~-~-build-v5.3.1585192026-20200326-1109,**(%%) Dragino LoRaWAN gateways support the communication to LoRaWAN (% style="color:#4f81bd" %)**ABP end node**(%%) locally without the need of LoRaWAN server. This feature allow us to integrate MQTT in the gateway to support LoRaWAN to MQTT forwarding or visa verse.
--)))
++Since firmware LG02_LG08~-~-build-v5.3.1585192026-20200326-1109, Dragino LoRaWAN gateways support the communication to LoRaWAN ABP end node locally without the need of LoRaWAN server. This feature allow us to integrate MQTT in the gateway to support LoRaWAN to MQTT forwarding or visa verse.
--(((
--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.
--(% style="color:#4f81bd" %)**Video Instruction**(%%): (% style="color:blue" %)[[https:~~/~~/youtu.be/qJTY441-t90>>url:https://youtu.be/qJTY441-t90]]
--)))
++When use test this feature, please use the version higher then : LG02_LG08~-~-build-v5.4.1593400722-20200629-1120, in this version, the upload format is changed and readable, which is easier for integration.
--(((
--(% style="color:#4f81bd" %)**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.
--)))
--(((
--(% style="color:#4f81bd" %)**Step 2**(%%): Make sure your Radio settings match the End Node settings.
--)))
--[[image:image-20220527141235-21.png]]
++Video Instruction:[[https:~~/~~/youtu.be/qJTY441-t90>>url:https://youtu.be/qJTY441-t90]]
++
++Step 1: Refer [[Communicate with ABP End Node>>url:https://wiki.dragino.com/index.php/Communication_with_ABP_End_Node]] to know how to set up LG308 to work with LoRaWAN End node.
++
++Step 2: Make sure your Radio settings match the End Node settings.
++
++[[image:https://wiki.dragino.com/images/thumb/f/f7/LG308_MQTT_5.png/600px-LG308_MQTT_5.png||height="387" width="600"]]
++
  Use Same Frequency Band as End Node
--(((
--(((
--(% style="color:#4f81bd" %)**Step 3**(%%): Set up publish format and MQTT channel. The LG308 will store the Data from End node in (% style="color:#4f81bd" %)**HEX format**(%%) in the file. And we need to config the format to (% style="color:#4f81bd" %)**META**
--)))
--)))
++Step 3: Set up publish format and MQTT channel. The LG308 will store the Data from End node in HEX format in the file. And we need to config the format to META
--[[image:image-20220527141450-22.png]]
++[[image:https://wiki.dragino.com/images/thumb/8/8d/LG308_MQTT_3.png/600px-LG308_MQTT_3.png||height="385" width="600"]]
  Publish mush use META as data format for LG308
--(% style="color:#4f81bd" %)**Step 4**(%%): Map the Device Address to Remote ID in MQTT server.
++Step 4: Map the Device Address to Remote ID in MQTT server.
--[[image:image-20220527141727-23.png]]
++[[image:https://wiki.dragino.com/images/thumb/7/7f/LG308_MQTT_4.png/600px-LG308_MQTT_4.png||height="335" width="600"]]
  Map Dev Addr to remote ID
--(% style="color:#4f81bd" %)**Step 5: Upstream**(%%): Save the change, we can see the log info via "sytem log", End Node and MQTT Server
++Step 5: Upstream: Save the change, we can see the log info via "sytem log", End Node and MQTT Server
--[[image:image-20220527141843-24.png]]
++[[image:https://wiki.dragino.com/images/thumb/b/be/LG308_MQTT_6.png/600px-LG308_MQTT_6.png||height="279" width="600"]]
  Upstream Process
++[[image:https://wiki.dragino.com/images/thumb/0/07/LG308_MQTT_6_1.png/600px-LG308_MQTT_6_1.png||height="246" width="600"]]
--[[image:image-20220527141933-25.png]]
--
  Choose ASCII Format
++[[image:https://wiki.dragino.com/images/thumb/a/a3/LG308_MQTT_6_2.png/600px-LG308_MQTT_6_2.png||height="248" width="600"]]
--[[image:image-20220527142028-26.png]]
--
  LHT65 Decoder
++Step 6: Set up subscribe: Subscribe a topci for downstream.
--(% style="color:#4f81bd" %)**Step 6: Set up subscribe**(%%)**:** Subscribe a topci for downstream.
++[[image:https://wiki.dragino.com/images/thumb/b/b9/LG308_MQTT_7.png/600px-LG308_MQTT_7.png||height="176" width="600"]]
--[[image:image-20220527142115-27.png]]
--
  Subscribe to a topic
--(% style="color:#4f81bd" %)**Step 7: Downstream**(%%): Save the change, we can see the log info via "sytem log", End Node and MQTT Server.
++Step 7: Downstream: Save the change, we can see the log info via "sytem log", End Node and MQTT Server.
--[[image:image-20220527142239-28.png]]
++[[image:https://wiki.dragino.com/images/thumb/9/97/LG308_MQTT_8.png/600px-LG308_MQTT_8.png||height="298" width="600"]]
  Downstream Flow
--(% style="color:red" %)**Notice: The text use for Downstream must meet the requirement from [[LG308 Downstream Payload>>Communicate with ABP End Node without LoRaWAN Network Server --- LG308||anchor="H2.2Downstream"]]**
++Notice: The text use for Downstream must meet the requirement from [[LG308 Downstream Payload>>url:https://wiki.dragino.com/index.php/Communication_with_ABP_End_Node#Downstream]]
--= 5. How to Debug =
++= 5. Example For Different MQTT Servers =
--User can login the gateway's console and run (% style="color:#4f81bd" %)**logread -f**(%%). It will shows the output when there is packet arrive.User can see if it is correct.
++(% style="width:731.222px" %)
++|=(% style="width: 270px;" %)(((
++[[image:https://wiki.dragino.com/images/thumb/7/73/ThingSpeak1.png/200px-ThingSpeak1.png||alt="ThingSpeak1.png" height="114" width="233"]]
++== [[ThingSpeak Server>>url:http://www.thingspeak.com/]] ==
--= 6. How to ask for Support =
++[[Examples>>url:https://wiki.dragino.com/index.php/ThingSpeak_Examples]]
++)))|=(% style="width: 242px;" %)(((
++[[image:https://wiki.dragino.com/images/thumb/3/3b/Lewei50.png/200px-Lewei50.png||alt="Lewei50.png" height="65" width="223"]]
++
++(% class="wikigeneratedid" %)
++==   ==
++
++== [[乐联网平台>>url:https://www.lewei50.com/]] ==
++
++
++[[lewei Example>>url:https://wiki.dragino.com/index.php/Lewei_Example_mqtt]]
++)))|=(% style="width: 214px;" %)(((
++[[image:https://wiki.dragino.com/images/thumb/a/aa/AWS-IOT.png/200px-AWS-IOT.png||alt="AWS-IOT.png" height="112" width="183"]]
++
++== [[AWS-IOT>>url:https://aws.amazon.com/cn/iot-platform/how-it-works/]] ==
++
++
++[[AWS Examples>>url:https://wiki.dragino.com/index.php/MQTT_Forward_to_Amazon_AWS-IOT]]
++)))
++
++= 6. How to Debug =
++
++User can login the gateway's console and run (% class="mark" %)**logread -f**(%%). It will shows the output when there is packet arrive.User can see if it is correct.
++
++= 7. How to ask for Support =
++
  If a user still not have trouble making it works. please send a mail to support@dragino.com with the below info:
  * Detail of your LoRaWAN end node.

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Changes for page MQTT Forward Instruction

Summary

Details

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