I feel like you are correct. The XDL radio doesn’t use any pairing security (pin code), it simply connects when prompted. I don’t typically interface with the XDL via BT as the GNSS I normally use with it doesn’t support BT. This was just something I wanted to try to see if I could go wireless with the RS2. I will try and play with this a bit more but I don’t have a ton of time to dedicate to it.
@dmitriy.ershov do you have any suggested settings to change on the XDL? All I can really change is baud rate, parity, stop bit ect. The article you linked didn’t specify the radio data rates.