Use a single job to ping all devices in the Broadlink integration (#5…

…1466)

homeassistant/components/broadlink/heartbeat.py

@@ -44,11 +44,15 @@ async def async_heartbeat(self, now):
         """Send packets to feed watchdog timers."""
         hass = self._hass
         config_entries = hass.config_entries.async_entries(DOMAIN)
+        hosts = {entry.data[CONF_HOST] for entry in config_entries}
+        await hass.async_add_executor_job(self.heartbeat, hosts)
 
-        for entry in config_entries:
-            host = entry.data[CONF_HOST]
+    @staticmethod
+    def heartbeat(hosts):
+        """Send packets to feed watchdog timers."""
+        for host in hosts:
             try:
-                await hass.async_add_executor_job(blk.ping, host)
+                blk.ping(host)
             except OSError as err:
                 _LOGGER.debug("Failed to send heartbeat to %s: %s", host, err)
             else: