I recently seem to have had a total lapse of cognitive ability and have been staring at my USB to micro USB adapter here:
https://www.aliexpress.com/store/pr...-mobile-phone-to-USB/1988232_32669867029.html
for days with the idea that it was an OTG adapter, which is not, and they are not the same. Micro OTG requires a jumper between pin 4 and pin 5.
I just ordered a hand full of micro OTG adapter cables but in the meantime I will make one for testing purposes from some old cables I have. After I get it built I will re-attempt using a few of the Android applications that I was unsuccessful with previously and hopefully report back with a Bluetooth-less solution.
Edit: Or maybe what I have is an OTG adapter and not just a USB to micro USB adapter. Still researching.
You have to remember, if you are going to plug in a dongle/receiver that is going to require a power source, it's going to suck it from your device's battery and your run time is going to be very limited. Trust me on that one. Running the screen as bright as it can, the onboard GPS for local position full time and having to power the outboard dongle from your device's battery is going to run it down extremely fast without a means of external power.
Now most OTG devices cannot use a simple Y cable to apply external power AND have a USB dongle connected at once period. If you look at that ElementalX
address I posted above, some devices can be modified to do so but there are just a few of them. If you don't own one, don't know how to "root" your device, you will be out of luck and your tracking time will be constrained.
I do not think that receive Dongle for those 3DR radios are passive. That is they take power from the device to run and I don't think it pipes the NMEA strings over B/T directly. It's meant to decode from USB and go from there. Yeah you might be able to use your device to pipe the incoming strings over B/T to
"another" device but why do that? Use two devices? That sounds awkward.
Best strategy is to decode the NMEA strings right off the receiver in a local mapping app period. Kurt