Did you try with another USB cable?
Are you sure that you're using USB data cable not just charging USB cable?
Is there any dev file like /dev/tty.usb* after you connect PyTrack? (use Teminal to check that out)
Try on Windows machine maybe.
@dispatj Try the examples given... If it doesn't work, come back with details of what exactly you did (the code you used, as well as what you use to receive those beacons), what you expected, and what you actually got (including errors, logs, screenshots...).
It's 2019 now. In fact we're more than half way through 2019, and still it looks like the FiPy is useless for cellular in the UK.
In fact even though Things Mobile and Hologram offer 'IoT LTE sims', neither support NB-Iot or CAT-M1 LTE. So basically the FiPy can't be used some 18 months later.
I've just ordered a SIM7600E-H module from AliExpress instead :(
@quentho If you have three format specifiers in ustruct.pack(), you have to supply three values. The questions is, how you want to pack that into a message? And what is the value range of each sensor? And why do you add these 0001, 0010, 0011, 0100 (1,2,3,4) pattern into the string?
@KiraKiraSoul That's not a LiPy battery, it is a NIHM battery pack. You can run the Lopy4 from it, but it will not be charged.
Better use a single 18650 LiPo cell (3000 mAh typcially) and use a step-up converter to get 5V for you fan (e.g. Pololu U1V11F5)
Edit: you may also find fans which run at 3.5 V and less. That may be easier.