Request for feature of "native or a RFC 2217 implementation of the Serial class, depending on port/url"

[madhujk]

Versions

• Python:
• OS:
• Pymodbus:
• Modbus Hardware (if used):

Pymodbus Specific

• Server: tcp/rtu/ascii - sync/async
• Client: tcp/rtu/ascii - sync/async

Description

What were you trying, what has happened, what went wrong, and what did you expect?

Code and Logs

 # code and logs here.

[dhoomakethu]

@madhujk Could you provide more info on your request ?

[madhujk]

It is a request to support both, local ports and remote ports servers supporting rfc2217 format ,
format:
rfc2217://:[?[&...]]
socket://:[?logging={debug|info|warning|error}]
loop://[?logging={debug|info|warning|error}]
hwgrep://[&skip_busy][&n=N]
spy://port[?option[=value][&option[=value]]]
alt://port?class=

Pyserial support above url handler to connect to remote ports with "serial_for_url()".

pymodbus dymanically can connect to local port or remote port based on input to the server

[dhoomakethu]

@madhujk thanks for the idea. Its good to have but I do not see much users for this feature. I will leave this open for anyone to go ahead and implement and raise a PR. Feel free to contribute.

[isj4]

I need this, specifically the "hwgrep://" syntax.
Scenario: Remote box, two FTDI RS-485 USB adapters, other USB devices also show up as /dev/ttyUSB*, so I cannot rely on the device names as they change on reboot.
So ideally I would specify the serial ports to be:
"hwgrep://0403:6001" and "hwgrep://0403:6001&n=2"

I hacked the pymodbus module, sync.py, ModbusSerialClient.connect()
Instead of:

        self.socket = serial.Serial(port=self.port,
                                    timeout=self.timeout,
                                    bytesize=self.bytesize,
                                    stopbits=self.stopbits,
                                    baudrate=self.baudrate,
                                    parity=self.parity)

I use this:

        self.socket = serial.serial_for_url(self.port,
                                            timeout=self.timeout,
                                            bytesize=self.bytesize,
                                            stopbits=self.stopbits,
                                            baudrate=self.baudrate,
                                            parity=self.parity)

That's it. Works for me.

[dhoomakethu]

@isj4 Thanks for the workaround, I will see if this is something we can support from the pymodbus library directly

[github-actions]

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