Wireguard component (#4256)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Co-authored-by: Simone Rossetto <simros85@gmail.com>
Co-authored-by: Thomas Bernard <thomas0bernard@gmail.com>

esphome/components/wireguard/sensor.py

@@ -0,0 +1,30 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import sensor
+from esphome.const import (
+    DEVICE_CLASS_TIMESTAMP,
+    ENTITY_CATEGORY_DIAGNOSTIC,
+)
+
+from . import Wireguard
+
+CONF_WIREGUARD_ID = "wireguard_id"
+CONF_LATEST_HANDSHAKE = "latest_handshake"
+
+DEPENDENCIES = ["wireguard"]
+
+CONFIG_SCHEMA = {
+    cv.GenerateID(CONF_WIREGUARD_ID): cv.use_id(Wireguard),
+    cv.Optional(CONF_LATEST_HANDSHAKE): sensor.sensor_schema(
+        device_class=DEVICE_CLASS_TIMESTAMP,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
+    ),
+}
+
+
+async def to_code(config):
+    parent = await cg.get_variable(config[CONF_WIREGUARD_ID])
+
+    if latest_handshake_config := config.get(CONF_LATEST_HANDSHAKE):
+        sens = await sensor.new_sensor(latest_handshake_config)
+        cg.add(parent.set_handshake_sensor(sens))