Since I have little else to do at the moment than playing with my phone, I debugged the USB OTG port of my Sony Z5, which led me to install the rtl-sdr driver, which led me to install some non-GNU Radio application to test the SDR capability of the phone, and it works. I haven't learnt anything in the process.
I do have Tom's detailed description on compiling GNU Radio but I am afraid the 2017 flowchart for 3.7 is no longer valid, and I have Bastian's video showing off GNU Radio 3.8 on android which also does not teach me much other than making me envious. Is there some documentation on getting started, considering I have absolutely no clue on how to cross compile to Android ? Thanks, JM -- JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, 25000 Besancon, France