o Overhaul of the bluetooth code.

 - Adding support for reading FLOAT (specified in IEEE 11073-20601) values from a bluetooth device.
 - More shared pointers to help keep track of the object's lifecycle. Makes sure that the connections are released back to Linux, Linux is way to sensitive with crashing applications.
o Adding support for reading the temperature sensors from the SoilMoisture device.

2 files changed, 44 insertions, 8 deletions

diff --git a/include/ble/Bluetooth.h b/include/ble/Bluetooth.h
index d238377..8da602f 100644
--- a/include/ble/Bluetooth.h
+++ b/include/ble/Bluetooth.h
@@ -7,6 +7,7 @@
 #include <stdexcept>
 #include <vector>
 #include <cstdint>
+#include <map>
 
 #include "ByteBuffer.h"
 
@@ -115,7 +116,7 @@ public:
 
     virtual void addCharacteristic(BluetoothGattCharacteristic *characteristic) = 0;
 
-    virtual const boost::optional<BluetoothGattCharacteristic &> findCharacteristic(boost::uuids::uuid uuid) const = 0;
+    virtual const boost::optional<const BluetoothGattCharacteristic &> findCharacteristic(boost::uuids::uuid uuid) const = 0;
 };
 
 class BluetoothGatt {
@@ -165,9 +166,9 @@ public:
 
     virtual void stopScan() = 0;
 
-    virtual void runScan(std::function<void(BluetoothDevice &device)>) = 0;
+    virtual void runScan(std::function<void(const shared_ptr<BluetoothDevice> &device)>) = 0;
 
-    virtual BluetoothDevice &getDevice(Mac &mac) = 0;
+    virtual shared_ptr <BluetoothDevice> getDevice(Mac &mac) = 0;
 
 protected:
     BluetoothAdapter();
@@ -185,6 +186,11 @@ public:
     BluetoothSystem();
 
     ~BluetoothSystem();
+
+    shared_ptr<BluetoothAdapter> getAdapter(string name);
+
+private:
+    map<string, shared_ptr<BluetoothAdapter>> adapters;
 };
 
 enum AttPduType {
@@ -227,7 +233,7 @@ public:
     static void makeWrite(ByteBuffer &req, uint16_t handle, const ByteBuffer &bytes);
 
 private:
-    static void checkType(ByteBuffer &bytes, AttPduType type);
+//    static void checkType(ByteBuffer &bytes, AttPduType type);
 
     static vector<AttributeData> parse(ByteBuffer &bytes, AttPduType type);
 
@@ -247,10 +253,6 @@ private:
     AttributeData(uint16_t handle, ByteBuffer value);
 };
 
-shared_ptr<BluetoothAdapter> getAdapter(int hciDevice);
-
-void shutdown();
-
 boost::uuids::uuid makeUuid(const boost::uuids::uuid base, uint8_t a, uint8_t b);
 
 }
diff --git a/include/ble/ByteBuffer.h b/include/ble/ByteBuffer.h
index d977c67..1032187 100644
--- a/include/ble/ByteBuffer.h
+++ b/include/ble/ByteBuffer.h
@@ -7,6 +7,29 @@
 #include <iosfwd>
 #include <memory>
 #include <stdexcept>
+#include <math.h>
+
+namespace FLOAT {
+static const uint32_t positive_infinity = 0x007FFFFE;
+static const uint32_t negative_infinity = 0x00800002;
+static const uint32_t NaN = 0x007FFFFF;
+static const uint32_t NRes = 0x00800000;
+static const uint32_t FLAOT_reserved_value = 0x00800001;
+
+// (2^23 - 3) * 10^127
+static const double max = 8.388604999999999e+133;
+static const double min = -max;
+
+static const double mantissa_max = 0x007FFFFD;
+static const double exponent_max = 127;
+static const double exponent_min = -128;
+
+// 10^-128
+static const double epsilon = 1e-128;
+
+// 10^upper(23 * log(2) / log(10))
+static const double precision = 10000000;
+}
 
 class ByteBufferException : public std::runtime_error {
 public:
@@ -53,6 +76,8 @@ public:
 
     ByteBuffer &write16le(uint16_t value);
 
+    ByteBuffer &write32le(uint32_t value);
+
     /**
     * Appends the entire buffer. Make a view if you want to write a part of it.
     */
@@ -60,12 +85,21 @@ public:
 
     ByteBuffer &write(const uint8_t *bytes, size_t len);
 
+    ByteBuffer &writeFLOAT(double d);
+
     uint8_t get8(size_t index) const;
 
     uint8_t read8();
 
     uint16_t read16le();
 
+    uint32_t read32le();
+
+    /**
+     * IEEE-11073 32-bit FLOAT
+     */
+    double readFLOAT();
+
     void copy(uint8_t *bytes, size_t length) const;
 
     /**