> On Jul 27, 2016, at 12:07 PM, Travis Griggs <travisgriggs@xxxxxxxxx> wrote: > > This is surely my own fault. But my understanding of dbus is quaint enough that I don’t get what the problem is. I use a python3 variant/evolution of the example-advertisement and example-gatt-server to make my Linux SBC a BLE peripheral. Upgrading my bluez libraries from 5.40 to 5.41, I’m suddenly getting an error that I wasn’t seeing before: > > ERROR:dbus.connection:Unable to set arguments (dbus.ObjectPath('/'), {}) according to signature None: <class 'ValueError'>: Unable to guess signature from an empty dict > Traceback (most recent call last): > File "/usr/lib/python3/dist-packages/dbus/connection.py", line 604, in msg_reply_handler > reply_handler(*message.get_args_list(**get_args_opts)) > File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 401, in _introspect_reply_handler > self._introspect_execute_queue() > File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 387, in _introspect_execute_queue > proxy_method(*args, **keywords) > File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 137, in __call__ > **keywords) > File "/usr/lib/python3/dist-packages/dbus/connection.py", line 584, in call_async > message.append(signature=signature, *args) > ValueError: Unable to guess signature from an empty dict > ERROR:dbus.connection:Unable to set arguments (dbus.ObjectPath('/nelson_irrigation/twig_pilot'), {}) according to signature None: <class 'ValueError'>: Unable to guess signature from an empty dict > Traceback (most recent call last): > File "/usr/lib/python3/dist-packages/dbus/connection.py", line 604, in msg_reply_handler > reply_handler(*message.get_args_list(**get_args_opts)) > File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 401, in _introspect_reply_handler > self._introspect_execute_queue() > File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 387, in _introspect_execute_queue > proxy_method(*args, **keywords) > File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 137, in __call__ > **keywords) > File "/usr/lib/python3/dist-packages/dbus/connection.py", line 584, in call_async > message.append(signature=signature, *args) > ValueError: Unable to guess signature from an empty dict > > One of the errors (the second) goes away if I just try to bring up advertising (no application/services defined). > > The only thing I can see that I am doing significantly different from the original examples, is that I derive my PATH_BASE as ‘/nelson_irrigation/twig_pilot’ rather than '/org/bluez/example/service’. I notice that the PATH_BASE value is showing up in there. Does this PATH_BASE matter more than it used to (it was basically arbitrary before)? If so, what do I need to change to make it work again? Argh. Ignore this. I build debian packages with the latest and install those. The default bluetooth.service has to be tweaked to include the ‘-E’ option. Did I see that 5.42 may see the -Experimental interface turned on by default? That would be cool… since 42 IS the answer.-- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html