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178	178	[[image:image-20220607170145-1.jpeg]]
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181	181	For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI.
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183	183	Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
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185	185	**Add APP EUI in the application**
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187	187	[[image:image-20220610161353-4.png]]
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225	225	== 2.3  ​Uplink Payload ==
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228	228	LDDS75 will uplink payload via LoRaWAN with below payload format:
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230	230	Uplink payload includes in total 4 bytes.
231	231	Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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265	265	=== 2.3.2  Distance ===
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267	267	Get the distance. Flat object range 280mm - 7500mm.
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269	269	For example, if the data you get from the register is 0x0B 0x05, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** 0B05(H) = 2821 (D) = 2821 mm.**
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272	272	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
273	273	* If the sensor value lower than 0x0118 (280mm), the sensor value will be invalid. Since v1.1.4, all value lower than 280mm will be set to 0x0014(20mm) which means the value is invalid.
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275	275	=== 2.3.3  Interrupt Pin ===
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277	277	This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.3A0SetInterruptMode"]] for the hardware and software set up.