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44		-NarrowBand-Internet of Things (NB-IoT) is a (% style="color:blue" %)**standards-based low power wide area (LPWA) technologyTCP, MQTT, UDP, and CoAP**(%%) for different application requirements.
	44	+NarrowBand-Internet of Things (NB-IoT) is a (% style="color:blue" %)**standards-based low power wide area (LPWA) technology**(%%) developed to enable a wide range of new IoT devices and services. NB-IoT significantly improves the power consumption of user devices, system capacity, and spectrum efficiency, especially in deep coverage.
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	48	+NDS03A supports different uplink methods including (% style="color:blue" %)**TCP, MQTT, UDP, and CoAP**(%%) for different application requirements.
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48	48	NDS03A is powered by (% style="color:blue" %)**8500mAh Li-SOCI2 battery**(%%), It is designed for long-term use of up to 5 years. (Actually Battery life depends on the use environment, update period & uplink method)
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111	111	(% style="color:blue" %)**NB-IoT Spec:**
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113		-* - B1 @H-FDD: 2100MHz
114		-* - B3 @H-FDD: 1800MHz
115		-* - B8 @H-FDD: 900MHz
116		-* - B5 @H-FDD: 850MHz
117		-* - B20 @H-FDD: 800MHz
118		-* - B28 @H-FDD: 700MHz
	117	+* B1 @H-FDD: 2100MHz
	118	+* B3 @H-FDD: 1800MHz
	119	+* B8 @H-FDD: 900MHz
	120	+* B5 @H-FDD: 850MHz
	121	+* B20 @H-FDD: 800MHz
	122	+* B28 @H-FDD: 700MHz
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362	362	|(% style="width:98px" %)[[Time stamp>>||anchor="H2.4.7A0Timestamp"]]|(% style="width:115px" %)Door Status(pb14)|(% style="width:92px" %)door open num(pb14)|(% style="width:99px" %)last open time(pb14)|(% style="width:67px" %)Time stamp|(% style="width:74px" %)...
363	363
364		-
365	365	(% style="color:blue" %)**When AT+TTRCHANNEL=2:**
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380	380	|(% style="width:102px" %)last open time(pb14)|(% style="width:93px" %)Door Status(pb15)|(% style="width:91px" %)door open num(pb15)|(% style="width:100px" %)last open time(pb15)|(% style="width:63px" %)[[Time stamp>>||anchor="H2.4.7A0Timestamp"]]|(% style="width:87px" %)......
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382		-
383	383	If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NDS03A uplink data.
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385	385	[[image:image-20221117145932-2.png]]
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412	412	* (% style="color:#037691" %)**Timestamp:**(%%) 0x637590df =1668649183 (Unix Time)
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	417	+
415	415	== 2.4  Payload Explanation and Sensor Interface ==
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417	417	=== 2.4.1  Device ID ===
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529	529	* For each uplink probe, LED will be on for 500ms.
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	535	+
532	532	== 2.7  Alarm Base on Timeout ==
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