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0 pointseqvinox9h ago0 comments

The only things with a chance at succeeding in this space are putting USB-serial directly on the board + USB-C, or alternatively bluetooth classic RFCOMM profile. (The latter is a very long shot.)

Apart from that, this doesn't even touch upon the various voltage levels for logic-level serial ports, or the question of whether to Vref or not to Vref. (Or RTS/CTS.)

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russdill8h ago

Microcontrollers that support BLE are getting so cheap this really is becoming an option. Hopefully with some button that activates it.

markrages6h ago

RFCOMM is old Bluetooth, not BLE.

Nordic has a serial-over-ble profile, but it is not standard like RFCOMM.

eqvinoxOP6h ago

Indeed… a fact making me really sad about BLE :(. The Nordic profile might become widespread enough to become de-facto standard, but AFAIK isn't quite widespread enough yet, i.e. people are still homebrewing almost the same thing(?)

russdill4h ago

I mean, sure there are still rough edges, but it's not like rs232 over Juliet is some widely supported standard.

There are Android apps that support serial over ble

dzhiurgis4h ago

Home Assistant and it’s relative esphome just added serial-proxy support. Basically you can use any esp32 board to add smart capabilities for old devices via serial port.

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