⚡ (BLE): Update connection parameters

libs/BLEKit/include/CoreGap.h

@@ -40,6 +40,8 @@ class CoreGap
 
 	CoreGapEventHandler _gap_event_handler;
 	ble::Gap &_gap;
+
+	std::function<void(ble::connection_handle_t handle)> _on_connection_callback {};
 };
 
 }	// namespace leka

libs/BLEKit/include/CoreGapEventHandler.h

@@ -24,7 +24,7 @@ class CoreGapEventHandler : public ble::Gap::EventHandler
 	void onDisconnectionComplete(ble::DisconnectionCompleteEvent const &event) override;
 	void onAdvertisingEnd(ble::AdvertisingEndEvent const &event) override;
 
-	void onConnectionCallback(const std::function<void()> &callback);
+	void onConnectionCallback(const std::function<void(ble::connection_handle_t handle)> &callback);
 	void onDisconnectionCallback(const std::function<void()> &callback);
 	[[nodiscard]] auto isConnected() const -> bool;
 
@@ -33,7 +33,7 @@ class CoreGapEventHandler : public ble::Gap::EventHandler
 
 	std::function<void()> _start_advertising {};
 
-	std::function<void()> _on_connection_callback {};
+	std::function<void(ble::connection_handle_t handle)> _on_connection_callback {};
 	std::function<void()> _on_disconnection_callback {};
 };
 

libs/BLEKit/source/CoreGap.cpp

@@ -60,7 +60,19 @@ void CoreGap::setAdvertising(AdvertisingData advertising_data)
 
 void CoreGap::onConnectionCallback(const std::function<void()> &callback)
 {
-	_gap_event_handler.onConnectionCallback(callback);
+	_on_connection_callback = [&, callback](connection_handle_t handle) {
+		// ? : See mbed-os/connectivity/FEATURE_BLE/include/ble/Gap.h for definitions
+		// ? : Apple guidelines https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf#page=221
+		auto min_connection_interval = conn_interval_t {12};   // Min: 15ms = 12*1,25
+		auto max_connection_interval = min_connection_interval;
+		auto slave_latency			 = slave_latency_t::min();
+		auto supervision_timeout	 = supervision_timeout_t {500};
+		_gap.updateConnectionParameters(handle, min_connection_interval, max_connection_interval, slave_latency,
+										supervision_timeout);
+
+		callback();
+	};
+	_gap_event_handler.onConnectionCallback(_on_connection_callback);
 }
 
 void CoreGap::onDisconnectionCallback(const std::function<void()> &callback)

libs/BLEKit/source/CoreGapEventHandler.cpp

@@ -28,7 +28,8 @@ void CoreGapEventHandler::onConnectionComplete(ConnectionCompleteEvent const &ev
 	}
 
 	if (_on_connection_callback != nullptr) {
-		_on_connection_callback();
+		auto handle = event.getConnectionHandle();	 // CAUTION: check still exist
+		_on_connection_callback(handle);
 	}
 	is_connected = true;
 }
@@ -48,7 +49,7 @@ void CoreGapEventHandler::onAdvertisingEnd(AdvertisingEndEvent const &event)
 	_start_advertising();
 }
 
-void CoreGapEventHandler::onConnectionCallback(const std::function<void()> &callback)
+void CoreGapEventHandler::onConnectionCallback(const std::function<void(connection_handle_t)> &callback)
 {
 	_on_connection_callback = callback;
 }