I’m testing the ADR sequences. On EU868 it works: now and then the device gets LinkAdrReq mac commands, which is good. However for AU915 and US915 gateways and devices, I never see any ADR coming by. According to TTN Adaptive Data Rate, I would expect after about 20 uplinks to get a LinkAdrReq, which never happens (I tested up to 72 uplink packets). Can it be that ADR is only supported by TTN for EU868? The gateway & device under test are on my desk:
TX PWR: 20 DR: 0 SF: 10 BW: 0 CR: 1 PL: 8 CRC: 1 IQ: 0 Packet RSSI: -53 dB SNR: 82 cB
Furthermore I think the network server should send LinkAdrReq’s until acknowledged immediately after a successful join on US915 and AU915 channel plans. Often gateways only support 8 of the 64 frequencies, and the device should know the channel masks it should use as soon as possible. Otherwise a device may use frequencies the gateway doesn’t listen too.