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16	16	* End Node traffic (from server UI) to shows end node activity in server. (Normaly possible)
17	17	* End Node Keys screen shot shows in end node and server. so we can check if the keys are correct. (In most case, we found keys doesn't match, especially APP EUI)
18	18
19		-**~1. End Device Join Screen shot, we can check:**
20	20
	20	+
	21	+(% style="color:blue" %)**1. End Device Join Screen shot, we can check:**
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21	21	* If the device is sending join request to server?
22	22	* What frequency the device is sending?
23	23
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26	26	Console Output from End device to see the transmit frequency
27	27
28	28
29		-**2. Gateway packet traffic in gateway web or ssh. we can check:**
	31	+(% style="color:blue" %)**2. Gateway packet traffic in gateway web or ssh. we can check:**
30	30
31	31	* If the gateway receive the Join request packet from sensor? (If this fail, check if the gateway and sensor works on the match frequency)
32	32	* If the gateway gets the Join Accept message from server and transmit it via LoRa?
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36	36	Console Output from Gateway to see packets between end node and server.
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38	38
39		-**3. Gateway Traffic Page in LoRaWAN Server**
	41	+(% style="color:blue" %)**3. Gateway Traffic Page in LoRaWAN Server**
40	40
41	41	* If the Join Request packet arrive the gateway traffic in server? If not, check the internet connection and gateway LoRaWAN server settings.
42	42	* If the server send back a Join Accept for the Join Request? if not, check if the keys from the device match the keys you put in the server, or try to choose a different server route for this end device.
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47	47	The Traffic for the End node in the server, use TTN as example
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49	49
50		-**4. Data Page in LoRaWAN server**
	52	+(% style="color:blue" %)**4. Data Page in LoRaWAN server**
51	51
52	52	* If this data page shows the Join Request message from the end node? If not, most properly you have wrong settings in the keys. Keys in the server doesn't match the keys in End Node.
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205	205	* This packet must match the frequency of the RX1 or RX2 window.
206	206	* This packet must match the DataRate of RX1(RX1DR) or RX2 (RX2DR). (% style="color:red" %)**This is the common fail point, because different lorawan server might use different RX2DR and they don't info End Node via ADR message so cause the mismatch. If this happen, user need to change the RX2DR to the right value in end node. In OTAA, LoRaWAN Server will send the RX2DR setting in Join Accept message so the end node will auto adjust. but ABP uplink doesn't support this auto change.**
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208	208	== 5.2 See Debug Info ==
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349	349	**Change to fix frequency:  AT+CHS=904900000**
350	350	**Change to fix DR:  AT+DR=0**
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352	352	[[image:image-20220526165525-16.png]]
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