Python implementation

MBasto

When I try to implement the first example from the python documentation i am always experiencing an error.
I have the certificate dowloaded and i am connected to the localhost (raspberry pi). However i get this in my terminal:
(base) miguelbasto@wlan-192200 ~ % /opt/anaconda3/bin/python /Users/miguelbasto/test1_motorcortex.py ERROR:mcx:[WAIT] Connection timeout after 1.0s - no event received Traceback (most recent call last): File "/Users/miguelbasto/test1_motorcortex.py", line 7, in <module> req, sub = motorcortex.connect("wss://192.168.2.100:5568:5567", motorcortex.MessageTypes(), parameter_tree, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/anaconda3/lib/python3.11/site-packages/motorcortex/init.py", line 52, in connect if not req.connect(makeUrl(req_address, req_port), **kwargs_copy).get(): ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/anaconda3/lib/python3.11/site-packages/motorcortex/reply.py", line 32, in get return self.future.result(timeout_ms / 1000.0 if timeout_ms else None) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/anaconda3/lib/python3.11/concurrent/futures/base.py", line 456, in result return self.get_result() ^^^^^^^^^^^^^^^^^^^ File "/opt/anaconda3/lib/python3.11/concurrent/futures/base.py", line 401, in __get_result raise self._exception File "/opt/anaconda3/lib/python3.11/concurrent/futures/thread.py", line 58, in run result = self.fn(*self.args, **self.kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/anaconda3/lib/python3.11/site-packages/motorcortex/request.py", line 550, in waitForConnection raise TimeoutError(f"Connection timeout after {timeout_sec}s") TimeoutError: Connection timeout after 1.0s. I also included a picture with the code. Thanks in advance.

Coen_Smeets

Hi Miguel,

The code looks correct, assuming that the login and password are correct, of course.
The problem could be caused by several things, so I have created a list to go over to identify where the issue might lie:

Motorcortex is not running.
This is an issue I run into quite a bit, so it’s always good to check whether the application is still running. Performing a sudo motorcortex restart on the Raspberry Pi via SSH ensures that you can connect to the device via 192.168.2.100 and that the application is running.

Double-check that the certificate can be found at that path.
In Python, you can use:

   import os

   if os.path.exists("/Users/miguelbasto/mcx.cert.crt"):
       print("Path exists")
   else:
       print("Path not found")

Increase the timeout
One second should be more than sufficient, but increasing it for testing purposes could help (for example, timeout_ms=5000).
Make sure the login and secret are correct for you device.

These are the four steps to double-check to see whether the issue lies there. If there are further problems, let me know and we can figure it out.

Coen Smeets

MBasto

Coen_Smeets Hi Coen I've gonne throught the steps and everything worked, so it must me the login and secret which are wrong. I am using my login credentials(so the email i use to login and the password), am I using the wrong ones?

Coen_Smeets

Hi!

The inputs that are configured here are the inputs to connect to the Motorcortex application. If you can connect via shh and perform sudo motorcortex restart, you have the username and the password.

When you ssh you do ssh LOGIN@192.168.2.100, where login is the username. By default this is admin.
After running the command sudo motorcortex restart, you will be prompted for the password. By default this is vectioneer.

These are the logins you can use to connect to the Motorcortex application.

Thus, it will look like (with default parameters):

# import the motorcortex library
import motorcortex

IP_ADDRESS = "wss://192.168.2.100"
PATH_TO_CERTIFICATE = "/Users/miguelbasto/mcx.cert.crt"
LOGIN = "admin"
PASSWORD = "vectioneer"

# Create a parameter tree object
parameter_tree = motorcortex.ParameterTree()
# Open request and subscribe connection
try:
  req, sub = motorcortex.connect(IP_ADDRESS, motorcortex.MessageTypes(), parameter_tree,
                                   certificate=PATH_TO_CERTIFICATE, timeout_ms=1000,
                                   login=LOGIN, password=PASSWORD)
  tree = parameter_tree.getParameterTree()
  print(f"Parameters: {tree}")
except RuntimeError as err:
    print(err)

Hopefully, you can connect now.

Coen Smeets

MBasto

Hi Coen unfortunately it is still not working, i get the following error:
miguelbasto@wlan-192200 ~ % /opt/anaconda3/bin/python /Users/miguelbasto/test1_motorcortex.py
ERROR:mcx:[WAIT] Connection timeout after 5.0s - no event received
Traceback (most recent call last):
File "/Users/miguelbasto/test1_motorcortex.py", line 14, in <module>
req, sub = motorcortex.connect(IP_ADDRESS, motorcortex.MessageTypes(), parameter_tree,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/anaconda3/lib/python3.11/site-packages/motorcortex/init.py", line 52, in connect
if not req.connect(makeUrl(req_address, req_port), **kwargs_copy).get():
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/anaconda3/lib/python3.11/site-packages/motorcortex/reply.py", line 32, in get
return self.future.result(timeout_ms / 1000.0 if timeout_ms else None)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/anaconda3/lib/python3.11/concurrent/futures/base.py", line 456, in result
return self.get_result()
^^^^^^^^^^^^^^^^^^^
File "/opt/anaconda3/lib/python3.11/concurrent/futures/base.py", line 401, in __get_result
raise self._exception
File "/opt/anaconda3/lib/python3.11/concurrent/futures/thread.py", line 58, in run
result = self.fn(*self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/anaconda3/lib/python3.11/site-packages/motorcortex/request.py", line 550, in waitForConnection
raise TimeoutError(f"Connection timeout after {timeout_sec}s")
TimeoutError: Connection timeout after 5.0s

Coen_Smeets

Hi,

You configured your network correctly via the documentation? Link To Doc

These four parameters should be the make or break so it is one of these four:

IP_ADDRESS = "wss://192.168.2.100"
PATH_TO_CERTIFICATE = "/Users/miguelbasto/mcx.cert.crt"
LOGIN = "admin"
PASSWORD = "vectioneer"

The IP_ADDRESS is the same ip that you use for ssh with the addition of wss:// in front (The ports are not needed with the latest motorcortex-python version (Perhaps you should try pip install motorcortex-python --upgrade --force-reinstall to get the latest version)
To check whether the PATH_TO_CERTIFICATE is correct and can be found use the code I provided in my first response.
If you can ssh with ssh admin@192.168.2.100 then the username is admin.
If you can sudo motorcortex restart with the password vectioneer then the password is default: vectioneer. If you use a different password then also use that password in the Python login.
Make sure motorcortex is running! SSH into it and perform sudo motorcortex restart. Wait a few seconds and run sudo motorcortex status to see whether the application is still running.

Note that with the standard certificate the application will stop after 30 minutes and thus requires a sudo motorcortex restart to run again. So while developing without a proper license, it might be unable to connect then checking whether Motorcortex is running is the first step.

Coen Smeets