Problems with not reading are down to the signal strength limits set by the EU. They are the same as alarm remote controls but don't take into account data has to be in complete chains not just on/off and that radio waves dislike metal cages.
Taking temperature into account is why you want an internal sensor and properly developed software, not some students project with an industrial P-V and the Bluetooth on his phone.
Sensor batteries get run down by endlessly trying to connect to a system that's just out of range, just like your phone trying to connect to duff wi-fi. Ultimately, assuming they cannot have a more powerful signal they'll mount receivers inside the mudguard to pick up sensors built into the tyre.
Andy
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