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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.
	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.
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48		-NDS03A supports different uplink methods including (% style="color:blue" %)**TCP, MQTT, UDP, and CoAP**(%%) for different application requirements.
49		-)))
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52	52	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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77	77	* 8500mAh Battery for long-term use
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	76	+
80	80	== 1.3  Storage & Operation ==
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121	121	* - B28 @H-FDD: 700MHz
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	121	+
124	124	== 1.7  Pin Definitions and Switch ==
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364	364	|(% 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" %)...
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366	366	(% style="color:blue" %)**When AT+TTRCHANNEL=2:**
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381	381	|(% 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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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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	414	+
414	414	== 2.4  Payload Explanation and Sensor Interface ==
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416	416	=== 2.4.1  Device ID ===
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527	527	* After NDS03A join NB-IoT network. The LED will be ON for 3 seconds.
528	528	* For each uplink probe, LED will be on for 500ms.
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	531	+
530	530	== 2.7  Alarm Base on Timeout ==
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852	852	* NDS03A Open/Close Door Sensor x 1
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	857	+
855	855	= 9.  Support =
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