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212	212
213	213	= 4.  Downlink =
214	214
215		-(% class="wikigeneratedid" %)
216	216	== 4.1 Convert HEX to Base64 ==
217	217
218	218	(% 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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548	548	Finish.
549	549
550	550
	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 =
553	553
554		-== 6.1  MIC Mismatch or MIC Failed ==
	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.
555	555
	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 the chirpstack-application and then continuously write to a file
	563	+
	564	+[[image:image-20221012174220-2.png]]
	565	+
	566	+
	567	+[[image:image-20221012184655-3.png||height="395" width="1049"]]
	568	+
	569	+
	570	+Each message is continuously logged to a specified file
	571	+
	572	+[[image:image-20221012174352-3.png]]
	573	+
	574	+
	575	+**//2). MQTT  Sub//**
	576	+
	577	+If you don't want to store the information via node-red, you can get the output via the subscribe command.
	578	+
	579	+
	580	+**If connecting from the same machine, you can use the following command to receive data:**
	581	+
	582	+(% class="box infomessage" %)
557	557	(((
	584	+mosquitto_sub -h localhost -t "application/#" -v
	585	+)))
	586	+
	587	+
	588	+**Different host**
	589	+
	590	+(% class="box infomessage" %)
	591	+(((
	592	+mosquitto_sub -h IPADDRESS -p 8883 ~-~-insecure ~-~-cafile ca.pem ~-~-cert cert.pem ~-~-key key.pem -t "application/#" -v
	593	+)))
	594	+
	595	+[[image:image-20221012173639-1.png]]
	596	+
	597	+
	598	+= 7.  Trouble Shooting =
	599	+
	600	+== 7.1  MIC Mismatch or MIC Failed ==
	601	+
	602	+
	603	+(((
558	558	When the device is registered or the device is working normally, the problem of MIC mismatch and MIC failed occurs.
559	559	)))
560	560

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