Make the Python controller listen on CHIP_PORT + 1 like all our other controllers

[bzbarsky-apple]

This way if both chip-device-ctrl and a server app are running on the
same IP they don't stomp on each other's ports.

Problem

Running chip-device-ctrl against an all-clusters-app on the same machine fails due to them both listening on the same port

Change overview

Use CHIP_PORT+1 for the listen port in the controller, like our other controllers.

Testing

Made sure that:

1. I can still connect -ble to an m5stack running all-clusters-app
2. Made sure that when doing connect -ip 127.0.0.1 against an all-clusters-app running on the same machine the responses from all-clusters-app make it to the Python controller instead of being received by all-clusters-app itself (which is what happened before this change, because the controller was claiming to be sending from CHIP_PORT.

[erjiaqing]

Instead of hard code a port number, can we add a parameter to python script for the port number and set it to CHIP_PORT + 1 by default?

[bluebin14]

Note that as long as chip-device-ctrl hardcodes the port to any number it will never be possible to connect to more than one server on the same IP. The full solution is to specify the port number like chip-tool does. The change here only fixes the 1 client + 1 server on the same IP case. A backwards compatible syntax for specifying the port would be:
Use default port:
connect -ip 127.0.0.1
Use specific port:
connect -ip 127.0.0.1/13000

[bzbarsky-apple]

can we add a parameter to python script for the port number and set it to CHIP_PORT + 1 by default?

Yes, we could. I filed #7822 on this.

The full solution is to specify the port number like chip-tool does.

There are two port numbers: the port the controller runs on and the port the server runs on. chip-tool hardcodes (mostly; you can prep the PersistentStorage with a different value, I guess) the former, afaict, and allows controlling the latter via command-line arg.

I agree that connect -ip should take a port as argument. Filed #7823