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brendan-w / python-OBD

OBD-II serial module for reading engine data
GNU General Public License v2.0
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Can't connect to Obd after first time #212

Open mddrtg opened 3 years ago

mddrtg commented 3 years ago

Hi, I'm having a strange issue in which the simple example works only the first time I execute the code ,but once I try to execute again , I get the error which seems to be common here , the only way to make it work again is to reboot the whole pi.

"serial.serialutil.SerialException: read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?"

I've already configured dbus-org.bluez.service with ExecStart=/usr/lib/bluetooth/bluetoothd -C ExecStartPost=/usr/bin/sdptool add SP

and I also tried to clone the library from repository but still ..

the second issue which might relates to first one is that whenever I use the Async Connection , it always returns none.

I'm using Raspberry Pi 4 with Bluetooth OBD

gmaniak commented 3 years ago

From what you're describing it seems more of a problem with the connection to the adapter than a problem with the OBD library itself. Maybe try to manually open a serial connection to the adapter to see if that works?

What OBD adapter are you using? I saw a problem with fake ELM327 adapters. A second connect would fail. For me unplugging the OBD adapter and plugging it back in solved the problem.