Allow ble tracker to subscribe to ota start and stop the scanning (#3800)

esphome/components/ota/__init__.py

@@ -78,6 +78,7 @@ CONFIG_SCHEMA = cv.Schema(
 async def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
     cg.add(var.set_port(config[CONF_PORT]))
+    cg.add_define("USE_OTA")
     if CONF_PASSWORD in config:
         cg.add(var.set_auth_password(config[CONF_PASSWORD]))
         cg.add_define("USE_OTA_PASSWORD")

esphome/components/ota/ota_component.cpp

@@ -21,6 +21,8 @@ static const char *const TAG = "ota";
 
 static const uint8_t OTA_VERSION_1_0 = 1;
 
+OTAComponent *global_ota_component = nullptr;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+
 std::unique_ptr<OTABackend> make_ota_backend() {
 #ifdef USE_ARDUINO
 #ifdef USE_ESP8266
@@ -35,6 +37,8 @@ std::unique_ptr<OTABackend> make_ota_backend() {
 #endif  // USE_ESP_IDF
 }
 
+OTAComponent::OTAComponent() { global_ota_component = this; }
+
 void OTAComponent::setup() {
   server_ = socket::socket_ip(SOCK_STREAM, 0);
   if (server_ == nullptr) {

esphome/components/ota/ota_component.h

@@ -41,6 +41,7 @@ enum OTAState { OTA_COMPLETED = 0, OTA_STARTED, OTA_IN_PROGRESS, OTA_ERROR };
 /// OTAComponent provides a simple way to integrate Over-the-Air updates into your app using ArduinoOTA.
 class OTAComponent : public Component {
  public:
+  OTAComponent();
 #ifdef USE_OTA_PASSWORD
   void set_auth_password(const std::string &password) { password_ = password; }
 #endif  // USE_OTA_PASSWORD
@@ -103,5 +104,7 @@ class OTAComponent : public Component {
 #endif
 };
 
+extern OTAComponent *global_ota_component;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+
 }  // namespace ota
 }  // namespace esphome