Update to V169 - Now compiles under QT 5.9 (LTS). Fixed some warnings,

switched to using system QTScintilla library on Linux. This prevents
you from needing to compile it yourself, added preliminary support for
three buses with a GVRET device (for Macchina M2 boards)

connections/gvretserial.cpp

@@ -8,7 +8,7 @@
 #include "gvretserial.h"
 
 GVRetSerial::GVRetSerial(QString portName) :
-    CANConnection(portName, CANCon::GVRET_SERIAL, 2, 4000, true),
+    CANConnection(portName, CANCon::GVRET_SERIAL, 3, 4000, true),
     mTimer(this) /*NB: set this as parent of timer to manage it from working thread */
 {
     qDebug() << "GVRetSerial()";
@@ -170,7 +170,7 @@ bool GVRetSerial::piSendFrame(const CANFrame& frame)
     buffer[3] = (unsigned char)(ID >> 8);
     buffer[4] = (unsigned char)(ID >> 16);
     buffer[5] = (unsigned char)(ID >> 24);
-    buffer[6] = (unsigned char)((frame.bus) & 1);
+    buffer[6] = (unsigned char)((frame.bus) & 3);
     buffer[7] = (unsigned char)frame.len;
     for (c = 0; c < frame.len; c++)
     {
@@ -255,6 +255,10 @@ void GVRetSerial::connectDevice()
     output.append((char)0xF1); //and another command
     output.append((char)0x01); //Time Sync - Not implemented until 333 but we can try
 
+    output.append((char)0xF1);
+    output.append((char)0x12); //get number of actually implemented buses. Not implemented except on M2RET
+    mNumBuses = 2; //the proper number if 0x12 is not implemented
+
     continuousTimeSync = true;
 
     serial->write(output);
@@ -374,6 +378,10 @@ void GVRetSerial::procRXChar(unsigned char c)
             //qDebug() << "Got validated";
             rx_state = IDLE;
             break;
+        case 12:
+            rx_state = GET_NUM_BUSES;
+            rx_step = 0;
+            break;
         }
         break;
     case BUILD_CAN_FRAME:
@@ -593,7 +601,10 @@ void GVRetSerial::procRXChar(unsigned char c)
     case SET_SINGLEWIRE_MODE:
         rx_state = IDLE;
         break;
-
+    case GET_NUM_BUSES:
+        mNumBuses = c;
+        rx_state = IDLE;
+        break;
     }
 }