Merge pull request 'NewBluetoothVersion' (#1) from NewBluetoothVersion into main

Reviewed-on: https://tea.app-dev.hu/GNSS/RoverAndBaseStation/pulls/1

.vscode/settings.json

@@ -9,5 +9,6 @@
     "outline.showNamespaces": false,
     "outline.showProperties": false,
     "outline.showTypeParameters": false,
-    "outline.showVariables": false
+    "outline.showVariables": false,
+    "C_Cpp.errorSquiggles": "disabled"
 }

lib/BluetoothSerial/BTAddress.cpp

@@ -0,0 +1,88 @@
+#include "sdkconfig.h"
+#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)
+
+#include "BTAddress.h"
+#include <string>
+#include <sstream>
+#include <iomanip>
+#include <string.h>
+#include <stdio.h>
+#include <malloc.h>
+#ifdef ARDUINO_ARCH_ESP32
+#include "esp32-hal-log.h"
+#endif
+
+
+/**
+ * @brief Create an address from the native ESP32 representation.
+ * @param [in] address The native representation.
+ */
+BTAddress::BTAddress(esp_bd_addr_t address) {
+	memcpy(m_address, address, ESP_BD_ADDR_LEN);
+} // BTAddress
+
+
+/**
+ * @brief Create an address from a hex string
+ *
+ * A hex string is of the format:
+ * ```
+ * 00:00:00:00:00:00
+ * ```
+ * which is 17 characters in length.
+ *
+ * @param [in] stringAddress The hex representation of the address.
+ */
+BTAddress::BTAddress(std::string stringAddress) {
+	if (stringAddress.length() != 17) return;
+
+	int data[6];
+	sscanf(stringAddress.c_str(), "%x:%x:%x:%x:%x:%x", &data[0], &data[1], &data[2], &data[3], &data[4], &data[5]);
+	m_address[0] = (uint8_t) data[0];
+	m_address[1] = (uint8_t) data[1];
+	m_address[2] = (uint8_t) data[2];
+	m_address[3] = (uint8_t) data[3];
+	m_address[4] = (uint8_t) data[4];
+	m_address[5] = (uint8_t) data[5];
+} // BTAddress
+
+
+/**
+ * @brief Determine if this address equals another.
+ * @param [in] otherAddress The other address to compare against.
+ * @return True if the addresses are equal.
+ */
+bool BTAddress::equals(BTAddress otherAddress) {
+	return memcmp(otherAddress.getNative(), m_address, 6) == 0;
+} // equals
+
+
+/**
+ * @brief Return the native representation of the address.
+ * @return The native representation of the address.
+ */
+esp_bd_addr_t *BTAddress::getNative() {
+	return &m_address;
+} // getNative
+
+
+/**
+ * @brief Convert a BT address to a string.
+ *
+ * A string representation of an address is in the format:
+ *
+ * ```
+ * xx:xx:xx:xx:xx:xx
+ * ```
+ *
+ * @return The string representation of the address.
+ */
+std::string BTAddress::toString() {
+	auto size = 18;
+	char *res = (char*)malloc(size);
+	snprintf(res, size, "%02x:%02x:%02x:%02x:%02x:%02x", m_address[0], m_address[1], m_address[2], m_address[3], m_address[4], m_address[5]);
+	std::string ret(res);
+	free(res);
+	return ret;
+} // toString
+#endif

lib/BluetoothSerial/BTAddress.h

@@ -0,0 +1,27 @@
+#ifndef COMPONENTS_CPP_UTILS_BTADDRESS_H_
+#define COMPONENTS_CPP_UTILS_BTADDRESS_H_
+#include "sdkconfig.h"
+#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)
+#include <esp_gap_bt_api.h> // ESP32 BT
+#include <string>
+
+
+/**
+ * @brief A %BT device address.
+ *
+ * Every %BT device has a unique address which can be used to identify it and form connections.
+ */
+class BTAddress {
+public:
+	BTAddress(esp_bd_addr_t address);
+	BTAddress(std::string stringAddress);
+	bool           equals(BTAddress otherAddress);
+	esp_bd_addr_t* getNative();
+	std::string    toString();
+
+private:
+	esp_bd_addr_t m_address;
+};
+
+#endif /* CONFIG_BT_ENABLED */
+#endif /* COMPONENTS_CPP_UTILS_BTADDRESS_H_ */

lib/BluetoothSerial/BTAdvertisedDevice.h

@@ -0,0 +1,58 @@
+#ifndef __BTADVERTISEDDEVICE_H__
+#define __BTADVERTISEDDEVICE_H__
+
+#include "BTAddress.h"
+
+
+class BTAdvertisedDevice {
+public:
+    virtual ~BTAdvertisedDevice() = default;
+
+    virtual BTAddress   getAddress();
+    virtual uint32_t    getCOD();
+    virtual std::string getName();
+    virtual int8_t      getRSSI();
+
+
+    virtual bool        haveCOD();
+    virtual bool        haveName();
+    virtual bool        haveRSSI();
+
+    virtual std::string toString();
+};
+
+class BTAdvertisedDeviceSet : public virtual BTAdvertisedDevice {
+public:
+    BTAdvertisedDeviceSet();
+    //~BTAdvertisedDeviceSet() = default;
+    
+
+    BTAddress   getAddress();
+    uint32_t    getCOD();
+    std::string getName();
+    int8_t      getRSSI();
+
+
+    bool        haveCOD();
+    bool        haveName();
+    bool        haveRSSI();
+
+    std::string toString();
+
+    void setAddress(BTAddress address);
+    void setCOD(uint32_t cod);
+    void setName(std::string name);
+    void setRSSI(int8_t rssi);
+
+    bool m_haveCOD;
+    bool m_haveName;
+    bool m_haveRSSI;
+
+
+    BTAddress   m_address = BTAddress((uint8_t*)"\0\0\0\0\0\0");
+    uint32_t    m_cod;
+    std::string m_name;
+    int8_t      m_rssi;
+};
+
+#endif

lib/BluetoothSerial/BTAdvertisedDeviceSet.cpp

@@ -0,0 +1,71 @@
+#include "sdkconfig.h"
+#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)
+
+//#include <map>
+
+#include "BTAdvertisedDevice.h"
+//#include "BTScan.h"
+
+
+BTAdvertisedDeviceSet::BTAdvertisedDeviceSet() {
+	m_cod		       = 0;
+	m_name             = "";
+	m_rssi             = 0;
+
+	m_haveCOD	       = false;
+	m_haveName         = false;
+	m_haveRSSI         = false;
+} // BTAdvertisedDeviceSet
+
+BTAddress   BTAdvertisedDeviceSet::getAddress()    { return m_address; }
+uint32_t    BTAdvertisedDeviceSet::getCOD()        { return m_cod; }
+std::string BTAdvertisedDeviceSet::getName()       { return m_name; }
+int8_t      BTAdvertisedDeviceSet::getRSSI()	    { return m_rssi; }
+
+
+bool        BTAdvertisedDeviceSet::haveCOD()   { return m_haveCOD; }
+bool        BTAdvertisedDeviceSet::haveName()  { return m_haveName; }
+bool        BTAdvertisedDeviceSet::haveRSSI()  { return m_haveRSSI; }
+
+/**
+ * @brief Create a string representation of this device.
+ * @return A string representation of this device.
+ */
+std::string BTAdvertisedDeviceSet::toString() {
+	std::string res = "Name: " + getName() + ", Address: " + getAddress().toString();
+	if (haveCOD()) {
+		char val[6];
+		snprintf(val, sizeof(val), "%d", getCOD());
+		res += ", cod: ";
+		res += val;
+	}
+	if (haveRSSI()) {
+		char val[6];
+		snprintf(val, sizeof(val), "%d", (int8_t)getRSSI());
+		res += ", rssi: ";
+		res += val;
+	}
+	return res;
+} // toString
+
+
+void BTAdvertisedDeviceSet::setAddress(BTAddress address) {
+    m_address = address;
+}
+
+void BTAdvertisedDeviceSet::setCOD(uint32_t cod) {
+    m_cod     = cod;
+	m_haveCOD = true;
+}
+
+void BTAdvertisedDeviceSet::setName(std::string name) {
+    m_name     = name;
+	m_haveName = true;
+}
+
+void BTAdvertisedDeviceSet::setRSSI(int8_t rssi) {
+    m_rssi     = rssi;
+	m_haveRSSI = true;
+}
+
+#endif /* CONFIG_BT_ENABLED */

lib/BluetoothSerial/BTScan.h

@@ -0,0 +1,35 @@
+#ifndef __BTSCAN_H__
+#define __BTSCAN_H__
+
+#include <map>
+#include <string>
+#include <Print.h>
+#include "BTAddress.h"
+#include "BTAdvertisedDevice.h"
+
+class BTAdvertisedDevice;
+class BTAdvertisedDeviceSet;
+
+
+class BTScanResults {
+public:
+	virtual ~BTScanResults() = default;
+
+    virtual void        		dump(Print *print = nullptr);
+    virtual int         		getCount();
+    virtual BTAdvertisedDevice* getDevice(uint32_t i);
+};
+
+class BTScanResultsSet : public BTScanResults {
+public:
+    void                	dump(Print *print = nullptr);
+    int                 	getCount();
+    BTAdvertisedDevice*		getDevice(uint32_t i);
+
+	bool add(BTAdvertisedDeviceSet advertisedDevice, bool unique = true);
+	void clear();
+
+    std::map<std::string, BTAdvertisedDeviceSet> m_vectorAdvertisedDevices;
+};
+
+#endif

lib/BluetoothSerial/BTScanResultsSet.cpp

@@ -0,0 +1,88 @@
+#include "sdkconfig.h"
+#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)
+
+
+#include <esp_err.h>
+
+#include "BTAdvertisedDevice.h"
+#include "BTScan.h"
+//#include "GeneralUtils.h"
+#include "esp32-hal-log.h"
+
+
+class BTAdvertisedDevice;
+
+/**
+ * @brief Dump the scan results to the log.
+ */
+void BTScanResultsSet::dump(Print *print) {
+	int cnt = getCount();
+	if (print == nullptr) {
+		log_v(">> Dump scan results : %d", cnt);
+		for (int i=0; i < cnt; i++) {
+			BTAdvertisedDevice* dev = getDevice(i);
+			if (dev)
+				log_d("- %d: %s\n", i+1, dev->toString().c_str());
+			else
+				log_d("- %d is null\n", i+1);
+		}
+		log_v("-- dump finished --");
+	} else {
+		print->printf(">> Dump scan results: %d\n", cnt);
+		for (int i=0; i < cnt; i++) {
+			BTAdvertisedDevice* dev = getDevice(i);
+			if (dev)
+				print->printf("- %d: %s\n", i+1, dev->toString().c_str());
+			else
+				print->printf("- %d is null\n", i+1);
+		}
+		print->println("-- Dump finished --");
+	}
+} // dump
+
+
+/**
+ * @brief Return the count of devices found in the last scan.
+ * @return The number of devices found in the last scan.
+ */
+int BTScanResultsSet::getCount() {
+	return m_vectorAdvertisedDevices.size();
+} // getCount
+
+
+/**
+ * @brief Return the specified device at the given index.
+ * The index should be between 0 and getCount()-1.
+ * @param [in] i The index of the device.
+ * @return The device at the specified index.
+ */
+BTAdvertisedDevice* BTScanResultsSet::getDevice(uint32_t i) {
+	if (i < 0)
+		return nullptr;
+
+	uint32_t x = 0;
+	BTAdvertisedDeviceSet* pDev = &m_vectorAdvertisedDevices.begin()->second;
+	for (auto it = m_vectorAdvertisedDevices.begin(); it != m_vectorAdvertisedDevices.end(); it++) {
+		pDev = &it->second;
+		if (x==i)	break;
+		x++;
+	}
+	return x==i ? pDev : nullptr;
+}
+
+void BTScanResultsSet::clear() {
+    //for(auto _dev : m_vectorAdvertisedDevices)
+	//	delete _dev.second;
+	m_vectorAdvertisedDevices.clear();
+}
+
+bool BTScanResultsSet::add(BTAdvertisedDeviceSet advertisedDevice, bool unique) {
+	std::string key = advertisedDevice.getAddress().toString();
+	if (!unique || m_vectorAdvertisedDevices.count(key) == 0) {
+		m_vectorAdvertisedDevices.insert(std::pair<std::string, BTAdvertisedDeviceSet>(key, advertisedDevice));
+		return true;
+	} else
+		return false;
+}
+
+#endif

lib/BluetoothSerial/BluetoothSerial.h

@@ -0,0 +1,75 @@
+#ifndef _BLUETOOTH_SERIAL_H_
+#define _BLUETOOTH_SERIAL_H_
+
+#include "sdkconfig.h"
+
+#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)
+
+#include "Arduino.h"
+#include "Stream.h"
+#include <esp_gap_bt_api.h>
+#include <esp_spp_api.h>
+#include <functional>
+#include "BTScan.h"
+
+typedef std::function<void(const uint8_t *buffer, size_t size)> BluetoothSerialDataCb;
+typedef std::function<void(uint32_t num_val)> ConfirmRequestCb;
+typedef std::function<void(boolean success)> AuthCompleteCb;
+typedef std::function<void(BTAdvertisedDevice* pAdvertisedDevice)> BTAdvertisedDeviceCb;
+
+class BluetoothSerial: public Stream
+{
+    public:
+
+        BluetoothSerial(void);
+        ~BluetoothSerial(void);
+
+        bool begin(String localName=String(), bool isMaster=false, uint16_t rxQueueSize = 512 * 2, uint16_t txQueueSize = 512);
+        bool begin(unsigned long baud){//compatibility
+            return begin();
+        }
+        int available(void);
+        int peek(void);
+        bool hasClient(void);
+        int read(void);
+        size_t write(uint8_t c);
+        size_t write(const uint8_t *buffer, size_t size);
+        void flush();
+        void end(void);
+        void onData(BluetoothSerialDataCb cb);
+        esp_err_t register_callback(esp_spp_cb_t callback);
+        
+        void onConfirmRequest(ConfirmRequestCb cb);
+        void onAuthComplete(AuthCompleteCb cb);
+        void confirmReply(boolean confirm);
+
+        void enableSSP();
+        bool setPin(const char *pin);
+        bool connect(String remoteName);
+        bool connect(uint8_t remoteAddress[]);
+        bool connect();
+        bool connected(int timeout=0);
+        bool isReady(bool checkMaster=false, int timeout=0);
+        bool disconnect();
+        bool unpairDevice(uint8_t remoteAddress[]);
+
+        BTScanResults* discover(int timeout=0x30*1280);
+        bool discoverAsync(BTAdvertisedDeviceCb cb, int timeout=0x30*1280);
+        void discoverAsyncStop();
+        void discoverClear();
+        BTScanResults* getScanResults();
+        
+        const int INQ_TIME = 1280;   // Inquire Time unit 1280 ms
+        const int MIN_INQ_TIME = (ESP_BT_GAP_MIN_INQ_LEN * INQ_TIME);
+        const int MAX_INQ_TIME = (ESP_BT_GAP_MAX_INQ_LEN * INQ_TIME);
+        
+        operator bool() const;
+
+    private:
+        String local_name;
+
+};
+
+#endif
+
+#endif

platformio.ini

@@ -20,3 +20,6 @@ lib_deps =
 	greiman/SdFat@^2.2.0
 	jchristensen/JC_Button@^2.1.2
 	fbiego/ESP32Time@^2.0.0
+	avinabmalla/ESP32_BleSerial@1.0.4
+build_flags=
+	-I BluetoothSerial

src/bluetoothSelect.h

@@ -0,0 +1,175 @@
+#ifdef COMPILE_BT
+
+#include "BluetoothSerial.h"
+#include <BleSerial.h>
+
+class BTSerialInterface
+{
+  public:
+    virtual bool begin(String deviceName, bool isMaster, uint16_t rxQueueSize, uint16_t txQueueSize) = 0;
+    virtual void disconnect() = 0;
+    virtual void end() = 0;
+    virtual esp_err_t register_callback(esp_spp_cb_t callback) = 0;
+    virtual void setTimeout(unsigned long timeout) = 0;
+
+    virtual int available() = 0;
+    // virtual bool hasClient() = 0;
+    virtual size_t readBytes(uint8_t *buffer, size_t bufferSize) = 0;
+    virtual int read() = 0;
+
+    //virtual bool isCongested() = 0;
+    virtual size_t write(const uint8_t *buffer, size_t size) = 0;
+    virtual size_t write(uint8_t value) = 0;
+    virtual void flush() = 0;
+};
+
+
+class BTClassicSerial : public virtual BTSerialInterface, public BluetoothSerial
+{
+    // Everything is already implemented in BluetoothSerial since the code was
+    // originally written using that class
+  public:
+    bool begin(String deviceName, bool isMaster, uint16_t rxQueueSize, uint16_t txQueueSize)
+    {
+      return BluetoothSerial::begin(deviceName, isMaster, rxQueueSize, txQueueSize);
+    }
+
+    void disconnect()
+    {
+      BluetoothSerial::disconnect();
+    }
+
+    void end()
+    {
+      BluetoothSerial::end();
+    }
+
+    esp_err_t register_callback(esp_spp_cb_t callback)
+    {
+      return BluetoothSerial::register_callback(callback);
+    }
+
+    void setTimeout(unsigned long timeout)
+    {
+      BluetoothSerial::setTimeout(timeout);
+    }
+
+    int available()
+    {
+      return BluetoothSerial::available();
+    }
+
+    // bool hasClient()
+    // {
+    //   return BluetoothSerial::hasClient();
+    // }
+
+    size_t readBytes(uint8_t *buffer, size_t bufferSize)
+    {
+      return BluetoothSerial::readBytes(buffer, bufferSize);
+    }
+
+    int read()
+    {
+      return BluetoothSerial::read();
+    }
+
+    size_t write(const uint8_t *buffer, size_t size)
+    {
+      return BluetoothSerial::write(buffer, size);
+    }
+
+    size_t write(uint8_t value)
+    {
+      return BluetoothSerial::write(value);
+    }
+
+    void flush()
+    {
+      BluetoothSerial::flush();
+    }
+};
+
+class BTLESerial : public virtual BTSerialInterface, public BleSerial
+{
+  public:
+    // Missing from BleSerial
+    bool begin(String deviceName, bool isMaster, uint16_t rxQueueSize, uint16_t txQueueSize)
+    {
+        BleSerial::begin(deviceName.c_str());
+        return true;
+    }
+
+    void disconnect()
+    {
+        Server->disconnect(Server->getConnId());
+    }
+
+    void end()
+    {
+        BleSerial::end();
+    }
+
+    esp_err_t register_callback(esp_spp_cb_t callback)
+    {
+        connectionCallback = callback;
+        return ESP_OK;
+    }
+
+    void setTimeout(unsigned long timeout)
+    {
+        BleSerial::setTimeout(timeout);
+    }
+
+    int available()
+    {
+        return BleSerial::available();
+    }
+
+    size_t readBytes(uint8_t *buffer, size_t bufferSize)
+    {
+        return BleSerial::readBytes(buffer, bufferSize);
+    }
+
+    int read()
+    {
+        return BleSerial::read();
+    }
+
+    size_t write(const uint8_t *buffer, size_t size)
+    {
+        return BleSerial::write(buffer, size);
+    }
+
+    size_t write(uint8_t value)
+    {
+        return BleSerial::write(value);
+    }
+
+    void flush()
+    {
+        BleSerial::flush();
+    }
+
+    // override BLEServerCallbacks
+    void onConnect(BLEServer *pServer)
+    {
+        // bleConnected = true; Removed until PR is accepted
+        if(connectionCallback){
+        // connectionCallback(ESP_SPP_SRV_OPEN_EVT, nullptr);
+        }
+    }
+
+    void onDisconnect(BLEServer *pServer)
+    {
+        // bleConnected = false; Removed until PR is accepted
+        esp_spp_cb_param_t* param = NULL;
+        connectionCallback(ESP_SPP_CLOSE_EVT, nullptr);
+        Server->startAdvertising();
+    }
+
+  private:
+    esp_spp_cb_t connectionCallback;
+};
+
+#endif

src/main.cpp

@@ -292,7 +292,7 @@ bool zedUartPassed = false; //Goes true during testing if ESP can communicate wi
 volatile int counter = 0;
 long lastTime = 0;
 
-#include <mybluetooth.h>
+#include "bluetoothSelect.h"
 
 // BluetoothSerial SerialBT;
 BTSerialInterface *bluetoothSerial; 
@@ -965,11 +965,11 @@ void loop()
     oled.setCursor(0,11);
     oled.printf("%d bytes",fileSize);
 
-    if(bluetoothSerial->hasClient())
-    {
-      oled.setCursor(0,21);
-      oled.println("BT connected");
-    }
+    // if(bluetoothSerial->hasClient())
+    // {
+    //   oled.setCursor(0,21);
+    //   oled.println("BT connected");
+    // }
 
     oled.display();
     }
@@ -1810,14 +1810,14 @@ void bluetoothStart()
     // else if (settings.bluetoothRadioType == BLUETOOTH_RADIO_BLE)
     //   bluetoothSerial = new BTLESerial();
 
-    if (bluetoothSerial->begin(deviceName) == false)
-    {
-      Serial.println("An error occurred initializing Bluetooth");
+    // if (bluetoothSerial->begin(deviceName) == false)
+    // {
+    //   Serial.println("An error occurred initializing Bluetooth");
 
-      if (productVariant == RTK_SURVEYOR)
-        digitalWrite(pin_bluetoothStatusLED, LOW);
-      return;
-    }
+    //   if (productVariant == RTK_SURVEYOR)
+    //     digitalWrite(pin_bluetoothStatusLED, LOW);
+    //   return;
+    // }
 
     //Set PIN to 1234 so we can connect to older BT devices, but not require a PIN for modern device pairing
     //See issue: https://github.com/sparkfun/SparkFun_RTK_Firmware/issues/5
@@ -1839,7 +1839,7 @@ void bluetoothStart()
     esp_bt_gap_set_pin(pin_type, 4, pin_code);
     //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 
-    bluetoothSerial->register_callback(bluetoothCallback); //Controls BT Status LED on Surveyor
+    // bluetoothSerial->register_callback(bluetoothCallback); //Controls BT Status LED on Surveyor
     bluetoothSerial->setTimeout(250);
 
     Serial.print("Bluetooth broadcasting as: ");

src/mybluetooth.h

@@ -1,76 +0,0 @@
-#include "BluetoothSerial.h"
-
-class BTSerialInterface
-{
-  public:
-    virtual bool begin(String deviceName) = 0;
-    virtual void disconnect() = 0;
-    virtual void end() = 0;
-    virtual esp_err_t register_callback(esp_spp_cb_t * callback) = 0;
-    virtual void setTimeout(unsigned long timeout) = 0;
-
-    virtual int available() = 0;
-    virtual bool hasClient() = 0;
-    virtual size_t readBytes(uint8_t *buffer, size_t bufferSize) = 0;
-
-    //virtual bool isCongested() = 0;
-    virtual size_t write(const uint8_t *buffer, size_t size) = 0;
-    virtual void flush() = 0;
-};
-
-
-class BTClassicSerial : public virtual BTSerialInterface, public BluetoothSerial
-{
-    // Everything is already implemented in BluetoothSerial since the code was
-    // originally written using that class
-  public:
-    bool begin(String deviceName)
-    {
-      return BluetoothSerial::begin(deviceName);
-    }
-
-    void disconnect()
-    {
-      BluetoothSerial::disconnect();
-    }
-
-    void end()
-    {
-      BluetoothSerial::end();
-    }
-
-    esp_err_t register_callback(esp_spp_cb_t * callback)
-    {
-      return BluetoothSerial::register_callback(callback);
-    }
-
-    void setTimeout(unsigned long timeout)
-    {
-      BluetoothSerial::setTimeout(timeout);
-    }
-
-    int available()
-    {
-      return BluetoothSerial::available();
-    }
-
-    bool hasClient()
-    {
-      return BluetoothSerial::hasClient();
-    }
-
-    size_t readBytes(uint8_t *buffer, size_t bufferSize)
-    {
-      return BluetoothSerial::readBytes(buffer, bufferSize);
-    }
-
-    size_t write(const uint8_t *buffer, size_t size)
-    {
-      return BluetoothSerial::write(buffer, size);
-    }
-
-    void flush()
-    {
-      BluetoothSerial::flush();
-    }
-};