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Jakeler / ble-serial

"RFCOMM for BLE" a UART over Bluetooth low energy (4+) bridge for Linux, Mac and Windows
https://blog.ja-ke.tech/tags/#bluetooth
MIT License
264 stars 37 forks source link

cannot write to BLE modul via Bluetooth #23

Closed arohrbacher closed 3 years ago

arohrbacher commented 3 years ago

Hi, I am having a weird problem with your ble-serial script. I am running it on a Raspberry Pi 3A+ with Raspbian Buster/Python 3.7.3; the BLE module I have is a AT-09/HM10-clone. After ble-scan I get the MAC address for this module. starting ble-serial: $ ble-serial -d xx:xx:xx:xx:xx:xx (MAC address obfuscated) 21:44:50.190 | INFO | linux_pty.py: Slave created on /tmp/ttyBLE -> /dev/pts/1 21:44:50.190 | INFO | ble_interface.py: Receiver set up 21:44:50.207 | INFO | ble_interface.py: Trying to connect with xx:xx:xx:xx:xx:xx 21:44:52.008 | INFO | ble_interface.py: Device xx:xx:xx:xx:xx:xx connected 21:44:52.166 | INFO | main.py: Running main loop! so the Bluetooth connection is working. I am then starting a terminal program on my raspi and connect to /dev/pts/1 -> this works without error My module is connected to the serial port on an other computer and this is running a terminal program (with correct baud rate etc). When I type on the remote terminal program the characters are received on the raspi and displayed in its terminal program: OK However, when I type in the raspi's terminal program, the remote terminal doesn't receive anything and the Bluetooth connection shuts down: z21:51:29.277 | ERROR | main.py: Bluetooth connection failed: org.bluez.Error.NotPermitted 21:51:29.277 | WARNING | main.py: Shutdown initiated 21:51:29.279 | INFO | linux_pty.py: Serial reader and symlink removed 21:51:31.907 | WARNING | ble_interface.py: Device xx:xx:xx:xx:xx:xx disconnected 21:51:31.908 | INFO | linux_pty.py: Stopping serial event loop 21:51:31.910 | INFO | ble_interface.py: Stopping Bluetooth event loop 21:51:31.912 | INFO | ble_interface.py: Bluetooth disconnected 21:51:31.913 | INFO | main.py: Shutdown complete.

The first character I entered locally was a "z", but this "z" didn't show up remotely. This also happens when I write directly from the console to /dev/pts/1 : no data is received by the remote terminal program and the Bluetooth connection shuts down...

Any idea what I am doing wrong?

Thanks,

arohrbacher

Jakeler commented 3 years ago

21:51:29.277 | ERROR | main.py: Bluetooth connection failed: org.bluez.Error.NotPermitted

Looks like this https://github.com/hbldh/bleak/issues/512 issue? Using BlueZ 5.51 seems to fix it for several people.

I guess running as root does not solve it? That is the first thing I would try with permission problems.

arohrbacher commented 3 years ago

OK, thanks!

Indeed running as root didn't solve the issue. However, after looking at the hbldh/bleak#512 issue I installed Bluez 5.51 and this fixed the issue for me: characters typed in the local terminal program showed up remotely and the Bluetooth connection stayed on. Just for grins I then installed Bluez 5.58 (the latest I could find): this also worked and my Bluetooth connection was stable. Anyway, for me the issue is solved: upshot is that one has to use a Bluez version >=5.51

Thanks for the useful scripts and your help!

arohrbacher

Jakeler commented 3 years ago

Awesome! Closing because it is solved.