I had a similar issue with getting an iPad 2 to connect to the R1. Unfortunately older devices are just out of luck. Not sure if it has to do with the bluetooth or what. Trimble R1 GNSS Bluetooth to iOS - YouTube
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Instead of making the type hidden, try keeping the type as select_one and making the ones you want hidden relevant to a workcrew member named "office" or something that the onsite inspectors will not choose.
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