Add getMTU to BLEDevice

Author: matpowel

src/BLEDevice.cpp

@@ -261,6 +261,11 @@ int BLEDevice::rssi()
   return _rssi;
 }
 
+uint16_t BLEDevice::getMTU() const
+{
+	return ATT.mtu(ATT.connectionHandle(_addressType, _address));
+}
+
 bool BLEDevice::connect()
 {
   return ATT.connect(_addressType, _address);

src/BLEDevice.h

@@ -68,6 +68,7 @@ class BLEDevice {
   int manufacturerData(uint8_t value[], int length) const;
 
   virtual int rssi();
+  virtual uint16_t getMTU() const;
 
   bool connect();
   bool discoverAttributes();

src/local/BLELocalDevice.cpp

@@ -283,6 +283,17 @@ int BLELocalDevice::rssi()
   return 127;
 }
 
+uint16_t BLELocalDevice::getMTU()
+{
+  BLEDevice central = ATT.central();
+
+  if (central) {
+    return central.getMTU();
+  }
+
+  return -1;
+}
+
 bool BLELocalDevice::setAdvertisedServiceUuid(const char* advertisedServiceUuid)
 {
   return _advertisingData.setAdvertisedServiceUuid(advertisedServiceUuid);

src/local/BLELocalDevice.h

@@ -47,6 +47,7 @@ class BLELocalDevice {
   virtual String address() const;
 
   virtual int rssi();
+  virtual uint16_t getMTU();
 
   virtual bool setAdvertisedServiceUuid(const char* advertisedServiceUuid);
   virtual bool setAdvertisedService(const BLEService& service);