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329	329
330	330	* End Node traffic (from server UI) to shows end node activity in server.
331	331
332		-
333	333	= 6. Downlink Issue ~-~- Packet REJECTED, unsupported frequency =
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448	448	(% class="wikigeneratedid" %)
449	449	4）We have had cases where it was automatically fixed the next day despite no manual changes, probably a server side issue
450	450
	450	+
451	451	= 10. Why i got the payload only with "0x00" or "AA~=~="? =
452	452
453	453
454		-(% style="color:blue" %)**Why this happen:**
	454	+(% style="color:blue" %)**Why sensor sends 0x00?**
455	455
456		-For US915, AU915 or AS923 frequencies.It is possible because: .
	456	+For US915, AU915 or AS923 frequencies, the max payload lenght is 11 bytes for DR0. Some times sensor needs to send MAC command to server, because the payload is 11 bytes, The MAC command + Payload will exceed 11 bytes and LoRaWAN server will ignore the uplink. In this case, Sensor will send two uplinks together: one uplink is the payload without MAC command, another uplink is **0x00 payload + MAC Command.**  For the second uplink, in the server side, it will shows the payload is 0x00. Normally, there are several case this will happen.
457	457
458		-When using the frequency mentioned above, the server sometimes adjusts the Data Rate (DR) of the node, because the end node has Adaptive Data Rate (ADR) Enabled.
	458	+**Possible Case 1**:
459	459
460		-When the server adjusts end node data rate to 0, the maximum payload length is 11 bytes. The server sometimes sends an ADR packet to the end node, and the node will reply to the server after receiving the ADR packet, but the number of payload bytes exceeds the limit, so it will send a normal uplink packet, and following an additional 00 data packet to handle this MAC command response.
	460	+Sensor has ADR=1 enable and sensor need to reply server MAC command (ADR request) while sensor has DR=0.
461	461
462	462
	463	+**Possible Case 2:**
	464	+
	465	+For the sensor which has Datalog Feature enable, the sensor will send TimeRequest MAC Command to sync the time. This Time Request will be sent once Sensor Join Network and Every 10 days. While they send such command with DR=0, sensor will send this command with 0x00 payload.
	466	+
	467	+
463	463	(% style="color:blue" %)**How to solve:**
464	464
465		-Solution: Use the decoder to filter out this 0x00 packet.
	470	+Solution:
466	466
	472	+~1. Use the decoder to filter out this 0x00 packet. (**Recommand**)
	473	+
	474	+2. Data rate changed from DR3 to DR5, increasing upload byte length
	475	+AT+ADR=0
	476	+AT+DR=3
	477	+
	478	+Downlink：
	479	+
	480	+[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H7.4DataRate>>http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H7.4DataRate]]
	481	+
467	467	Some node decoders may not have the filter function, or you need decoders of other servers and formats. Please send an email to [[support@dragino.com>>mailto:support@dragino.com]]
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