use dbus with ssh?

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use dbus with ssh?

dschingiskhan11 18 Feb 2019 15:10

Hi,

I successfully connected my RaspberryPi to my Thymio II.
Now I can control the Thymio with a simple Python script.

On the RaspberryPi I just run the following command to start asebamedulla.
Terminal 1:

asebamedulla "ser:device=/dev/ttyACM0"

Then I run my Python script.
Terminal 2:

python test.py

However, now I want to do this from my Mac with ssh.
When I do the same thing I get the following error:

pi@raspberrypi:~/Desktop $ python test.py 
Traceback (most recent call last):
  File "test.py", line 48, in <module>
    network = dbus.Interface(bus.get_object('ch.epfl.mobots.Aseba', '/'), dbus_interface='ch.epfl.mobots.AsebaNetwork')
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name ch.epfl.mobots.Aseba was not provided by any .service files

Does someone knows why and how I can fix this?

Thank you. :)

Edit:
Im using this code as an example:
https://www.thymio.org/en:thymioraspyexample

Last edited on 18 Feb 2019 15:11 by dschingiskhan11 Show more

Re: use dbus with ssh?

Michael Bonani 21 Feb 2019 08:21

Hello,
I never do that but what it is strange for me is the "ch.epfl.mobots.Aseba", that was the lab internet address while we was developpoing. Probably this is the problem?
Regards

Re: use dbus with ssh?

nico0201 16 Apr 2019 08:36

Hello, i have a similar issue;
I have a raspberry pi connected to my thymio and my wifi, I access to my raspberry throught ssh. I have installed aseba on it and i can run asebamedulla:

pi@raspberrypi:~ $ asebamedulla "ser:name=Thymio-II"
Found Thymio-II on port /dev/ttyACM0

But when i want to use the python code example : https://www.thymio.org/en:thymioraspyexample
I have lot of error and I don't see how can i solve it, it's been a week since I tried to solve this problem.

pi@raspberrypi:~ $ python test.py
Traceback (most recent call last):
  File "test.py", line 62, in <module>
    bus = dbus.SessionBus()
  File "/usr/lib/python2.7/dist-packages/dbus/_dbus.py", line 211, in __new__
    mainloop=mainloop)
  File "/usr/lib/python2.7/dist-packages/dbus/_dbus.py", line 100, in __new__
    bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 122, in __new__
    bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11

Thank you in advance

excuse me for my english

Re: use dbus with ssh?

nico0201 16 Apr 2019 17:57

I continue my search, and i start my raspberry pi in graphical mode and i have the exact same issue has dschingiskhan11, but i don't know why i have to replace "ch.epfl.mobots.Aseba"
Thank you in advance

Re: use dbus with ssh?

nico0201 16 Apr 2019 18:09

Finaly i succes my project !!!
I just forgotten to run asebamedulla ser:device=/dev/ttyACM0
So for other people who has the same issue, the solution of my problems was :
-install all libraries (dbus, optparse, gobject …)
-run graphical desktop (for the server X)
-don't forget to run "asebamedulla ser:device=/dev/ttyACM0" ;)

Re: use dbus with ssh?

riedo 17 Apr 2019 14:49

thank you for sharing!