Jetson Orin Nano Bluetooth RFCOMM Protocol Not Supported

[tomas]

I am trying to connect to a GPS receiver through bluetooth using python on my Jetson Orin Nano Developer Kit. Here is the relevant code:

import bluetooth 

# bluetooth address of the GPS device.
addr = "20:50:E7:52:1A:DB" # GPS 2
# port to use.
port = 1
# create a socket and connect to the GPS.
socket = bluetooth.BluetoothSocket(bluetooth.RFCOMM)

while True:
        try:
                socket.connect((addr,port))
                break
        except Exception as e:
                print("No Socket detected, trying again")
                socket.close()
                socket = bluetooth.BluetoothSocket(bluetooth.RFCOMM)
print("GPS Connected")

# MAIN LOOP START

try:
        while True:
                print("Reading...")
                # Receive and save GPS information
                val = socket.recv(1024)
                data = val.split()
                lat_r = float(data[2])
                lon_r = float(data[3])
                std_lat_r = float(data[8])
                std_lon_r = float(data[7])
                print("Lat: " + str(lat_r))
                print("Lon: " + str(lon_r))
                pass
                
except Exception as e: # if any error on the code , stop robot
        print("FATAL ERROR : ")
        print(e)
        socket.close()      

However, when I run the code I get the following message:

_bluetooth.error: (93, 'Protocol not supported')

I have installed both pybluez and libbluetooth-dev.

[KevinFFF]

Hi tomas,

What’s the Jetpack version in use?

Please run the following command to check BT status:

$ sudo service bluetooth status
$ hciconfig

Or check if it could help after installing the following packages:

$ sudo apt-get install --reinstall bluetooth bluez blueman

Please also check if there’s error showed in dmesg.

[tomas]

I’m using Jetpack Version 6.0

Output from bluetooth status

bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor pre>
    Drop-In: /usr/lib/systemd/system/bluetooth.service.d
             └─nv-bluetooth-service.conf
     Active: active (running) since Wed 2025-03-12 12:10:12 EDT; 7min ago
       Docs: man:bluetoothd(8)
   Main PID: 636 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 8814)
     Memory: 1.8M
        CPU: 76ms
     CGroup: /system.slice/bluetooth.service
             └─636 /usr/lib/bluetooth/bluetoothd -d --noplugin=audio,a2dp,avrcp

Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:load_ltks_comple>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:load_irks_comple>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:load_conn_params>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:local_name_chang>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:local_name_chang>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:local_name_chang>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:set_blocked_keys>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:local_name_chang>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:local_name_chang>
Mar 12 12:10:12 evatech-desktop bluetoothd[636]: src/adapter.c:local_name_chang>

Output from hciconfig

hci0:	Type: Primary  Bus: USB
	BD Address: 1C:CE:51:8E:74:6A  ACL MTU: 1021:6  SCO MTU: 255:12
	UP RUNNING 
	RX bytes:1387 acl:0 sco:0 events:89 errors:0
	TX bytes:2373 acl:0 sco:0 commands:89 errors:0

Installing the additional packages did not solve the problem.

I ran dmesg, and looked through the output for anything related to the bluetooth. Here’s what I found:

[    9.521718] Bluetooth: Core ver 2.22
[    9.529572] NET: Registered PF_BLUETOOTH protocol family
[    9.529581] Bluetooth: HCI device and connection manager initialized
[    9.529597] Bluetooth: HCI socket layer initialized
[    9.529602] Bluetooth: L2CAP socket layer initialized
[    9.529619] Bluetooth: SCO socket layer initialized
[    9.597542] input: USB Camera: USB Camera as /devices/platform/bus@0/3610000.usb/usb1/1-2/1-2.2/1-2.2:1.0/input/input11
[    9.615280] usbcore: registered new interface driver uvcvideo
[    9.630704] usbcore: registered new interface driver btusb
[    9.663255] rtk_btusb: Realtek Bluetooth USB driver ver 3.1.6fd4e69.20220818-105856

Here is a text file with the rest of the output if you need it.
dmesg.txt (64.1 KB)

[KevinFFF]

I don’t see any BT related error in your current log.

Please confirm if BT RFCOMM is enabled in your kernel.

$ zcat /proc/config.gz|grep CONFIG_BT_RFCOMM

@tomas

However, when I run the code I get the following message:

Could you share the full log when you run your python code?

[tomas]

After running the kernel command

CONFIG_BT_RFCOMM is not set

Full error message

Traceback (most recent call last):
  File "/home/evatech/Downloads/290/290b.py", line 8, in <module>
    socket = bluetooth.BluetoothSocket(bluetooth.RFCOMM)
  File "/home/evatech/.local/lib/python3.10/site-packages/bluetooth/bluez.py", line 165, in __init__
    _sock = _bt.btsocket (proto)
_bluetooth.error: (93, 'Protocol not supported')

[KevinFFF]

@tomas

CONFIG_BT_RFCOMM is not set

Could you try to enable it in kernel config(defconfig)?

CONFIG_BT_RFCOMM=y

You can refer to Kernel Customization — NVIDIA Jetson Linux Developer Guide 1 documentation to download/build kernel image.