pip install aioharmony

import asyncio
from aioharmony.harmonyapi import HarmonyAPI
async def main() -> None:
    client = HarmonyAPI(ip_address="192.168.1.203", protocol="WEBSOCKETS")
    await client.connect()
    try:
        print(f"Connected to {client.name} (firmware {client.fw_version})")
    finally:
        await client.close()
asyncio.run(main())

async def start_watch_tv(client: HarmonyAPI) -> None:
    activity_id = client.get_activity_id("Watch TV")
    if activity_id is None:
        raise ValueError("Activity 'Watch TV' is not configured on this hub")
    success, message = await client.start_activity(activity_id)
    if not success:
        raise RuntimeError(f"Failed to start activity: {message}")

async def show_and_power_off(client: HarmonyAPI) -> None:
    activity_id, activity_name = client.current_activity
    print(f"Current activity: {activity_name} ({activity_id})")
    await client.power_off()

from aioharmony.const import SendCommandDevice
async def volume_up(client: HarmonyAPI, device_name: str) -> None:
    device_id = client.get_device_id(device_name)
    if device_id is None:
        raise ValueError(f"Device {device_name!r} not found")
    command = SendCommandDevice(device=device_id, command="VolumeUp", delay=0.2)
    # send_commands returns an empty list on success, or a list of
    # SendCommandResponse entries describing the failures.
    errors = await client.send_commands(command)
    for err in errors:
        print(f"{err.command.command} failed: {err.msg} (code {err.code})")

from aioharmony.const import ClientCallbackType
def on_new_activity(info: tuple[int, str]) -> None:
    activity_id, activity_name = info
    print(f"Now running: {activity_name} ({activity_id})")
callbacks = ClientCallbackType(
    connect=None,
    disconnect=None,
    new_activity_starting=None,
    new_activity=on_new_activity,
    config_updated=None,
)
client = HarmonyAPI(
    ip_address="192.168.1.203", protocol="WEBSOCKETS", callbacks=callbacks
)

usage: __main__.py [-h] (--harmony_ip HARMONY_IP | --discover)
                   [--protocol {WEBSOCKETS,XMPP}]
                   [--loglevel {DEBUG,INFO,WARNING,ERROR,CRITICAL}]
                   [--logmodules LOGMODULES]
                   [--show_responses | --no-show_responses] [--wait WAIT]
                   {show_config,show_detailed_config,show_current_activity,start_activity,power_off,sync,listen,activity_monitor,send_command,change_channel}
                   ...
aioharmony - Harmony device control
positional arguments:
  {show_config,show_detailed_config,show_current_activity,start_activity,power_off,sync,listen,activity_monitor,send_command,change_channel}
    show_config         Print the Harmony device configuration.
    show_detailed_config
                        Print the detailed Harmony device configuration.
    show_current_activity
                        Print the current activity config.
    start_activity      Switch to a different activity.
    power_off           Stop the activity.
    sync                Sync the harmony.
    listen              Output everything HUB sends out. Use in combination
                        with --wait.
    activity_monitor    Monitor and show when an activity is changing. Use in
                        combination with --wait to keep monitoring
                        foractivities otherwise only current activity will be
                        shown.
    send_command        Send a simple command.
    send_commands       Send a series of simple commands separated by spaces.
    change_channel      Change the channel
optional arguments:
  -h, --help            show this help message and exit
  --harmony_ip HARMONY_IP
                        IP Address of the Harmony device, multiple IPs can be
                        specified as a comma separated list without spaces.
                        (default: None)
  --discover            Scan for Harmony devices. (default: False)
  --protocol {WEBSOCKETS,XMPP}
                        Protocol to use to connect to HUB. Note for XMPP one
                        has to ensure that XMPP is enabledon the hub.
                        (default: None)
  --loglevel {DEBUG,INFO,WARNING,ERROR,CRITICAL}
                        Logging level for all components to print to the
                        console. (default: ERROR)
  --logmodules LOGMODULES
                        Restrict logging to modules specified. Multiple can be
                        provided as a comma separated list without any spaces.
                        Use * to include any further submodules. (default:
                        None)
  --show_responses      Print out responses coming from HUB. (default: False)
  --no-show_responses   Do not print responses coming from HUB. (default:
                        False)
  --wait WAIT           How long to wait in seconds after completion, useful
                        in combination with --show-responses. Use -1 to wait
                        infinite, otherwise has to be a positive number.
                        (default: 0)