RFCOMM TTY support not available on Jetson Nano

Q&A
1

Hi everyone,

Recently, I tried to read data from external bluetooth sensor to the program in Jetson Nano. I found some tutorials which worked for raspberry Pi 3b+. The procedure is like this: 1)sudo nano /etc/systemd/system/dbus-org.bluez.service; 2)ExecStart=/usr/lib/bluetooth/bluetoothd -C; 3)
ExecStartPost=/usr/bin/sdptool add SP; 4) sudo rfcomm bind 0 00:04:3E:4B:32:40. By these commands, I could successfully read the data to the raspberry pi. However, when I applied them into Jetson Nano (because there is no bluetooth module for jetson nano, I used bluetooth adapter)， it could not work. If I edit /etc/systemd/system/dbus-org.bluez.service as I mentioned above, the bluetooth service even fails to start. When I give the command “sudo rfcomm bind 0 00:04:3E:4B:32:40”, the error message was threw which said “RFCOMM TTY support not available”. Is this error caused by my bluetooth adapter or other reasons? Could you provide some suggestions, thank you !

2

Very difficult to debug. Start with sudo dmesg and read everything carefully. Check with upstream bug reports. Which kernel did you install?

1 Like
3

Really thankful for your reply. I have been bothered by this issue for very long time. I googled a lot and asked many people for help but still difficult to find the solution.

  1. My kernel info shows as below
    lamb@lamb-desktop:~$ cat /etc/issue
    Ubuntu 18.04.3 LTS \n \l

lamb@lamb-desktop:~$ cat /proc/version
Linux version 4.9.140-tegra (buildbrain@mobile-u64-911) (gcc version 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ecfbc167ef90065c0eeb7f91977701] (Linaro GCC 7.3-2018.05) ) #1 SMP PREEMPT Tue Jul 16 17:04:49 PDT 2019

lamb@lamb-desktop:~$ uname -a
Linux lamb-desktop 4.9.140-tegra #1 SMP PREEMPT Tue Jul 16 17:04:49 PDT 2019 aarch64 aarch64 aarch64 GNU/Linux

  1. The log info of dmesg shows in this link (Paste.ee), because I am new to linux, could not understand well about the log info.

  2. I may find the reason why the error message shows “RFCOMM TTY support not available”. But I don’t know how to solve it. Please check below.
    lamb@lamb-desktop:~$ zcat /proc/config.gz | grep RFCOMM
    CONFIG_BT_RFCOMM=y

CONFIG_BT_RFCOMM_TTY is not set

  1. This is the info of my external bluetooth adapter.
    lamb@lamb-desktop:~$ lsusb
    Bus 002 Device 002: ID 0bda:0411 Realtek Semiconductor Corp.
    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 001 Device 006: ID 0461:4d0f Primax Electronics, Ltd HP Optical Mouse
    Bus 001 Device 005: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
    Bus 001 Device 004: ID 0bda:8179 Realtek Semiconductor Corp. RTL8188EUS 802.11n Wireless Network Adapter
    Bus 001 Device 003: ID 0461:0010 Primax Electronics, Ltd HP PR1101U / Primax PMX-KPR1101U Keyboard
    Bus 001 Device 002: ID 0bda:5411 Realtek Semiconductor Corp.
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

lamb@lamb-desktop:~$ hciconfig dev
hci0: Type: Primary Bus: USB
BD Address: 00:1A:7D:DA:71:13 ACL MTU: 310:10 SCO MTU: 64:8
UP RUNNING PSCAN ISCAN
RX bytes:658 acl:0 sco:0 events:44 errors:0
TX bytes:2191 acl:0 sco:0 commands:44 errors:0

Does the problem caused by my external bluetooth adapter or system configuration problem? Thank you for your time to help me!

4

Wrong forums. Please go to the Ubuntu forums for support.