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212	212
213	213	= 4.  Downlink =
214	214
	215	+(% class="wikigeneratedid" %)
215	215	== 4.1 Convert HEX to Base64 ==
216	216
217	217	(% style="color:red" %)**Note: Chirpstack uses base64 to downlink, the end node user manual provides HEX format of the downlink commands. So user needs to convert the HEX to Base64.**
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547	547	Finish.
548	548
549	549
550		-= **6. How to store/get all data traffic for a specific sensor, including raw payload, and uplink/ downlink history. ** =
551	551
	552	+= 6.  Trouble Shooting =
552	552
553		-All data is published to the MQTT topics. if you want to store/get the data, you would have to create an MQTT handler and store the data yourself.
	554	+== 6.1  MIC Mismatch or MIC Failed ==
554	554
555		-This example will be shown how to store/get all the data in two ways:
556	556
557		-**//1). Chirpstack ~-~-> Node-red//**
558		-
559		-
560		-[[image:image-20221012184501-1.png]]
561		-
562		-Use MQTT in Nore-red to subscribe to topics published by chirpstack-application and then continuously write to a file
563		-
564		-[[image:image-20221012174220-2.png]]
565		-
566		-
567		-Each message is continuously logged to a specified file
568		-
569		-[[image:image-20221012174352-3.png]]
570		-
571		-
572		-**//2). MQTT  Sub//**
573		-
574		-If you don't want to store the information via node-red, you can get the output via the subscribe command.
575		-
576		-
577		-**If connecting from the same machine, you can use the following command to receive data:**
578		-
579		-(% class="box infomessage" %)
580	580	(((
581		-mosquitto_sub -h localhost -t "application/#" -v
582		-)))
583		-
584		-
585		-**Different host**
586		-
587		-(% class="box infomessage" %)
588		-(((
589		-mosquitto_sub -h IPADDRESS -p 8883 ~-~-insecure ~-~-cafile ca.pem ~-~-cert cert.pem ~-~-key key.pem -t "application/#" -v
590		-)))
591		-
592		-[[image:image-20221012173639-1.png]]
593		-
594		-
595		-= 7.  Trouble Shooting =
596		-
597		-== 7.1  MIC Mismatch or MIC Failed ==
598		-
599		-
600		-(((
601	601	When the device is registered or the device is working normally, the problem of MIC mismatch and MIC failed occurs.
602	602	)))
603	603

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