BLE client support on ESP32 (#1177)

Co-authored-by: Ben Buxton <bb@cactii.net>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

tests/test1.yaml

@@ -9,6 +9,8 @@ esphome:
   name_add_mac_suffix: true
   platform: ESP32
   board: nodemcu-32s
+  platformio_options:
+    board_build.partitions: huge_app.csv
   on_boot:
     priority: 150.0
     then:
@@ -235,6 +237,19 @@ wled:
 
 adalight:
 
+esp32_ble_tracker:
+
+ble_client:
+  - mac_address: AA:BB:CC:DD:EE:FF
+    id: ble_foo
+  - mac_address: 11:22:33:44:55:66
+    id: ble_blah
+    on_connect:
+      then:
+       - switch.turn_on: ble1_status
+    on_disconnect:
+      then:
+       - switch.turn_on: ble1_status
 mcp23s08:
   - id: 'mcp23s08_hub'
     cs_pin: GPIO12
@@ -246,6 +261,18 @@ mcp23s17:
     deviceaddress: 1
 
 sensor:
+  - platform: ble_client
+    ble_client_id: ble_foo
+    name: "Green iTag btn"
+    service_uuid: 'ffe0'
+    characteristic_uuid: 'ffe1'
+    descriptor_uuid: 'ffe2'
+    notify: true
+    update_interval: never
+    on_notify:
+      then:
+        - lambda: |-
+            ESP_LOGD("green_btn", "Button was pressed, val%f", x);
   - platform: adc
     pin: A0
     name: 'Living Room Brightness'
@@ -1722,6 +1749,8 @@ switch:
       # Use pin number 0
       number: 0
       inverted: False
+  - platform: template
+    id: ble1_status
 
 fan:
   - platform: binary