Add service change_channel to Harmony component (#19649)

* Update requirements

Updated requirements

* Add attributes

Add firmware and config version attributes

* Small bump for aioharmony

Small version bump increase for aioharmony

* Order ATTR constants

* Add the service

Add service change_channel

* Fix requirements file

For some reason aioharmony ended up in there as a duplicate. Fixed it.

* Updates based on review

homeassistant/components/remote/harmony.py

@@ -26,6 +26,7 @@ REQUIREMENTS = ['aioharmony==0.1.2']
 
 _LOGGER = logging.getLogger(__name__)
 
+ATTR_CHANNEL = 'channel'
 ATTR_CURRENT_ACTIVITY = 'current_activity'
 
 DEFAULT_PORT = 8088
@@ -33,6 +34,7 @@ DEVICES = []
 CONF_DEVICE_CACHE = 'harmony_device_cache'
 
 SERVICE_SYNC = 'harmony_sync'
+SERVICE_CHANGE_CHANNEL = 'harmony_change_channel'
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Optional(ATTR_ACTIVITY): cv.string,
@@ -47,6 +49,11 @@ HARMONY_SYNC_SCHEMA = vol.Schema({
     vol.Optional(ATTR_ENTITY_ID): cv.entity_ids,
 })
 
+HARMONY_CHANGE_CHANNEL_SCHEMA = vol.Schema({
+    vol.Required(ATTR_ENTITY_ID): cv.entity_ids,
+    vol.Required(ATTR_CHANNEL): cv.positive_int
+})
+
 
 async def async_setup_platform(hass, config, async_add_entities,
                                discovery_info=None):
@@ -112,6 +119,10 @@ def register_services(hass):
         DOMAIN, SERVICE_SYNC, _sync_service,
         schema=HARMONY_SYNC_SCHEMA)
 
+    hass.services.async_register(
+        DOMAIN, SERVICE_CHANGE_CHANNEL, _change_channel_service,
+        schema=HARMONY_CHANGE_CHANNEL_SCHEMA)
+
 
 async def _apply_service(service, service_func, *service_func_args):
     """Handle services to apply."""
@@ -131,6 +142,11 @@ async def _sync_service(service):
     await _apply_service(service, HarmonyRemote.sync)
 
 
+async def _change_channel_service(service):
+    channel = service.data.get(ATTR_CHANNEL)
+    await _apply_service(service, HarmonyRemote.change_channel, channel)
+
+
 class HarmonyRemote(remote.RemoteDevice):
     """Remote representation used to control a Harmony device."""
 
@@ -348,6 +364,19 @@ class HarmonyRemote(remote.RemoteDevice):
                           result.command.msg
                           )
 
+    async def change_channel(self, channel):
+        """Change the channel using Harmony remote."""
+        import aioharmony.exceptions as aioexc
+
+        _LOGGER.debug("%s: Changing channel to %s",
+                      self.name, channel)
+        try:
+            await self._client.change_channel(channel)
+        except aioexc.TimeOut:
+            _LOGGER.error("%s: Changing channel to %s timed-out",
+                          self.name,
+                          channel)
+
     async def sync(self):
         """Sync the Harmony device with the web service."""
         import aioharmony.exceptions as aioexc