Add binary sensor to show whether clients are connected

Co-authored-by: Joshua Spence <josh@joshuaspence.com>

components/stream_server/binary_sensor.py

@@ -0,0 +1,43 @@
+# Copyright (C) 2023 Oxan van Leeuwen
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import binary_sensor
+from esphome.const import (
+    DEVICE_CLASS_CONNECTIVITY,
+    ENTITY_CATEGORY_DIAGNOSTIC,
+)
+from . import ns, StreamServerComponent
+
+CONF_CONNECTED = "connected"
+CONF_STREAM_SERVER = "stream_server"
+
+CONFIG_SCHEMA = cv.Schema(
+    {
+        cv.GenerateID(CONF_STREAM_SERVER): cv.use_id(StreamServerComponent),
+        cv.Required(CONF_CONNECTED): binary_sensor.binary_sensor_schema(
+            device_class=DEVICE_CLASS_CONNECTIVITY,
+            entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
+        ),
+    }
+)
+
+
+async def to_code(config):
+    server = await cg.get_variable(config[CONF_STREAM_SERVER])
+
+    sens = await binary_sensor.new_binary_sensor(config[CONF_CONNECTED])
+    cg.add(server.set_connected_sensor(sens))