Expose flow_control paramater from zigpy

Certain boards (such as the Sonoff Zigbee 3.0 USB Dongle Plus P) have a
hardware switch that allows for turning on hardware flow control (given
the correct firmware is flashed). This requires of course that zigpy-cli
also allows for setting this flag to be able to communicate with the
dongle.

Zigpy and zigpy-znp already support hardware flow control fully. No wit
is time that zigpy-cli also offers this option.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>

README.md

@@ -33,6 +33,8 @@ radio requires exclusive access to the hardware: if both are running at once, ne
 Network commands require the radio type to be specified. See `zigpy radio --help` for the list of supported types.
 If your radio requires a different baudrate than the radio library default (mainly EZSP), you must specify it as a command line option. For example, `zigpy radio --baudrate 115200 ezsp backup -`.
 
+Similarly if a different flow control is required ("hardware" for rtscts or "software" for xonxoff), this also must be specified, otherwise the driver default will be used (usually software flow control). For example, `zigpy radio --flow_control hardware znp backup -`.
+
 ## Network backup
 
 ```console

zigpy_cli/radio.py

@@ -25,9 +25,10 @@
 @click.argument("radio", type=click.Choice(list(RADIO_TO_PACKAGE.keys())))
 @click.argument("port", type=str)
 @click.option("--baudrate", type=int, default=None)
+@click.option("--flow_control", type=int, default=None)
 @click.option("--database", type=str, default=None)
 @click_coroutine
-async def radio(ctx, radio, port, baudrate=None, database=None):
+async def radio(ctx, radio, port, baudrate=None, flow_control=None, database=None):
     # Setup logging for the radio
     verbose = ctx.parent.params["verbose"]
     logging_configs = RADIO_LOGGING_CONFIGS[radio]
@@ -60,6 +61,9 @@ async def radio(ctx, radio, port, baudrate=None, database=None):
     if baudrate is not None:
         config["device"]["baudrate"] = baudrate
 
+    if flow_control is not None:
+	config["device"]["flow_control"] = flow_control
+
     app = radio_module.ControllerApplication(config)
 
     ctx.obj = app