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112	112	**(2)** **The object to be tested is a "corrugated cardboard box" perpendicular to the central axis of 0 °, and the length * width is 60cm * 50cm.**
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115	115	[[image:1654852175653-550.png]](% style="display:none" %) ** **
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176	176	[[image:image-20220607170145-1.jpeg]]
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179	179	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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181	181	Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
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183	183	**Add APP EUI in the application**
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185	185	[[image:image-20220610161353-4.png]]
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223	223	== 2.3  ​Uplink Payload ==
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226	226	LDDS75 will uplink payload via LoRaWAN with below payload format:
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228	228	Uplink payload includes in total 4 bytes.
229	229	Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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263	263	=== 2.3.2  Distance ===
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265	265	Get the distance. Flat object range 280mm - 7500mm.
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267	267	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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270	270	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.