I have the gollofoll issue, I am equiped with Trimble R4 model 2, Trimble Control Unit (CU) with OS: Win CE 18.104.22.168, field sodtware Trimble survey controller v12.50. The steps that I connect both devices are : CU Win CE from start menu- settings-control panel-bluetooth device propertices , on the pop-up menu I run scan device command, I found the device and click right arrow, on bluetoBlu manager i tryed both variants with authentitate and without, doesn't matter the result is same. I open TSC 12.5 and create new project, I setup everything necessary to start GNSS surveying, but when I click to to created survey style -start survey pop-up please wait menu/connecting to receiver/, but never connect. I use the same method with my 5800 GPS receiver without those problems. Every idea is well come!