Recently I have got one Dragino LPS8 gatway and two LHT65 Sensors. I started them up at home near to the gateway and could finally connect both to the TTN. One mistake I made was to miss to put in the “APP KEY” beside the “APP EUI” and “DEV EUI” on the TTN Console. “APP KEY” and “APP EUI” are printed on the sticker inside the small carton box. So there is no need to reprogram the “APP KEY” to the one generated by TTN. You simply can overwrite it in the TTN console by the one from the sticker.
Regarding coverage: One of the sensors I moved arround 1km. I was disapointed about that it does not connect to TTN anymore. Today I think I found the reason for this in the specification lorawan1_0_2-20161012_1398_1.pdf. There is written “Adaptive Data Rate control may not be possible when the radio channel attenuation changes fast and constantly”. This likely happend to the sensor due to the move by car 1km far away from the gateway without any transmission (was set to 10min period).
With the second sensor I checked out the scenario by moving it to the cellar of my house. Same situation. In the logread of the gateway, I saw that the LHT65 was sending with spread factor SF7 and 14dBm (EU variant) before. This seems to be to less. After I restarted the sensor in the cellar by pressing the button > 5sec it got connected with SF12. Sensor back in the first place, the SF went back to SF8. So adaption works fine in this direction.
In case there was already a connection to TTN and the attenuation is changed rapidly, activate the device again.