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649	649	(% _mstvisible="1" %)
650	650	[[image:image-20220523000825-10.png||_mstalt="450619" _mstvisible="3" height="413" width="728"]]
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652		-
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655	655	== (% _msthash="350454" _msttexthash="323544" _mstvisible="3" %)2.6 Datalog Feature(%%) ==
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657	657	(% _msthash="315262" _msttexthash="32283004" _mstvisible="1" %)
658	658	Datalog Feature is to ensure IoT Server can get all sampling data from Sensor even if the LoRaWAN network is down. For each sampling, LHT65N will store the reading for future retrieving purposes. There are two ways for IoT servers to get datalog from LHT65N.
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661	661	(% _mstvisible="1" %)
662	662	=== (% _msthash="886158" _msttexthash="842426" _mstvisible="3" %)2.6.1 Ways to get datalog via LoRaWAN(%%) ===
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668	668	1. IoT Server sends a downlink LoRaWAN command to [[poll the value>>||anchor="H2.6.4Pollsensorvalue"]] for specify time range.
669	669	1. Set [[PNACKMD=1>>||anchor="H4.13AutoSendNone-ACKmessages"]], LHT65N will wait for ACK for every uplink, when there is no LoRaWAN network, LHT65N will store the sensor data, and it will send all messages after network recover.
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673	673	(% _mstvisible="1" %)
674	674	=== (% _msthash="369915" _msttexthash="342797" _mstvisible="3" %)2.6.2 Unix TimeStamp(%%) ===
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698	698	(% _msthash="315265" _msttexthash="15137317" _mstvisible="1" %)
699	699	So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set the current time 2021 – Jan ~-~- 29 Friday 03:03:25
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702	702	(% _mstvisible="1" %)
703	703	=== (% _msthash="359294" _msttexthash="332748" _mstvisible="3" %)2.6.3 Set Device Time(%%) ===
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748	748	(((
749	749	(% _msthash="506076" _msttexthash="7889297" _mstvisible="2" %)
750	750	User needs to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server.
751		-
752		-(% _msthash="506076" _msttexthash="7889297" _mstvisible="2" %)
753		-
754	754	)))
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756	756	(% _mstvisible="1" %)