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643	643	Configure MQTT connections properly and send downlink commands to configure nodes through the Publish function of MQTT.fx//.//
644	644
645		-**1.** Configure node MQTT connection (via MQTT.fx):
	645	+**1.** **Configure node MQTT connection (via MQTT.fx):**
646	646
647	647	(% style="color:blue" %)**AT command:**
648	648
649		-* (% style="color:#037691" %)**AT+PRO=3,0 or 3,5 ** (%%)~/~/ hex format or json format
	649	+* (% style="color:#037691" %)**AT+PRO=3,0 or 3,5 ** (%%) **~/~/ hex format or json format**
650	650
651	651	* (% style="color:#037691" %)**AT+SUBTOPIC=User Defined**
652	652
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656	656
657	657	* (% style="color:#037691" %)**AT+PWD=<device name> or User Defined**
658	658
659		-* (% style="color:#037691" %)**AT+SERVADDR=8.217.91.207,1883 ** (%%) ~/~/ to set MQTT server address and port
	659	+* (% style="color:#037691" %)**AT+SERVADDR=8.217.91.207,1883 ** (%%) **~/~/ to set MQTT server address and port**
660	660
661	661	(% style="color:red" %)**Note: To uplink and downlink via MQTT.fx, we need set the publish topic and subscribe topic different, for example: AT+SUBTOPIC=SE01_SUB & AT+PUBTOPIC=SE01_PUB.**
662	662
663		-[[image:image-20240417180145-2.png||height="434" width="587"]][[image:image-20240417180737-3.png||height="431" width="584"]]
	663	+[[image:image-20240417180145-2.png||height="545" width="737"]]
664	664
	665	+[[image:image-20240417180737-3.png||height="544" width="738"]]
665	665
666		-**2. **When the node uplink packets, we can observe the data in MQTT.fx.
667	667
668		-[[image:image-20240418144337-1.png||height="709" width="802"]]
669	669
670		-**3. **The downlink command can be successfully sent only when the downlink port is open.
671	671
672		- The downlink port is opened for about 3 seconds after uplink packets are sent.
673	673
674		- Therefore, when we see the node uplink packets in the **Subscribe** window, we need to immediately switch to the **publish** window to publish the **hex format** command.
675	675
676		-[[image:image-20240418150435-3.png||height="582" width="659"]]
677		-
678		-[[image:image-20240418150932-4.png||height="492" width="1061"]]
679		-
680		-(% style="color:red" %)**Note: Users can edit the hex command in advance. When the node uplink, directly click the publish button several times to increase the success rate of command configuration.**
681		-
682		-
683		-
684		-
685		-
686		-
687		-
688	688	= 5. FAQ =
689	689
690	690	== 5.1 What is the usage of Multi Sampling and One Uplink? ==

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