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23	23	* If the device is sending join request to server?
24	24	* What frequency the device is sending?
25	25
26		-[[image:https://wiki.dragino.com/images/thumb/0/0f/OTAA_Join-1.jpg/600px-OTAA_Join-1.jpg||height="316" width="600"]]
	26	+[[image:image-20220526163523-1.png]]
27	27
28	28	Console Output from End device to see the transmit frequency
29	29
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33	33	* If the gateway receive the Join request packet from sensor? (If this fail, check if the gateway and sensor works on the match frequency)
34	34	* If the gateway gets the Join Accept message from server and transmit it via LoRa?
35	35
36		-[[image:https://wiki.dragino.com/images/thumb/1/1c/OTAA_Join-2.png/600px-OTAA_Join-2.png||height="325" width="600"]]
	36	+[[image:image-20220526163608-2.png]]
37	37
38	38	Console Output from Gateway to see packets between end node and server.
39	39
...	...	@@ -409,6 +409,8 @@
409	409
410	410	* (((
411	411	If a node is registered with multiple servers, it may also cause the "mic mismatch" error.
	412	+
	413	+
412	412	)))
413	413
414	414	= 10. Why i got the payload only with "0x00" or "AA~=~="? =
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427	427	Solution: Use the decoder to filter out this 00 packet.
428	428	)))
429	429	* (((
430		-Some node decoders may not have filtering function, or you need decoders of other servers and formats. Please send an email to david.huang@dragino.cc
431		-)))
	432	+Some node decoders may not have filtering function, or you need decoders of other servers and formats. Please send an email to [[david.huang@dragino.cc>>mailto:david.huang@dragino.cc]]
432	432
433		-(% class="wikigeneratedid" id="H" %)
	434	+
434	434
	436	+)))
	437	+
	438	+= 11. Why my Dev EUI and APP EUI is 0x000000000000, how to solve? =
	439	+
	440	+It is possible the keys is erased during upgrading of firmware. and the console output shows below after AT+CFG
	441	+
	442	+AT+APPKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	443	+
	444	+AT+NWKSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	445	+
	446	+AT+APPSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	447	+
	448	+AT+APPEUI=00 00 00 00 00 00 00 00
	449	+
	450	+
	451	+You can get the keys from the box sticker or send mail to Dragino Support to check keys with the provided SN number.
	452	+
	453	+You can rewrites the keys by running commands in AT Console
	454	+
	455	+For example：
	456	+
	457	+AT+APPKEY=85 41 47 20 45 58 28 14 16 82 A0 F0 80 0D DD EE
	458	+
	459	+AT+NWKSKEY=AA CC B0 20 30 45 37 32 14 1E 14 93 E2 3B 20 11
	460	+
	461	+AT+APPSKEY=11 23 02 20 30 20 30 60 80 20 20 30 30 20 10 10
	462	+
	463	+AT+APPEUI=2C 45 47 E3 24 12 23 24
	464	+
	465	+(Any combination of 16 bit codes can be used）
	466	+
	467	+

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