aqhome: implemented IPC client, fixed some bugs.

sending a PING request and retrieving the PONG response works now.

aqhome/msg/msg_ping.h

@@ -17,6 +17,7 @@
 #include <gwenhywfar/buffer.h>
 
 
+AQHOME_API GWEN_MSG *AQH_PingMsg_new(uint8_t code, uint8_t srcAddr, uint8_t destAddr);
 
 AQHOME_API uint32_t AQH_PingMsg_GetTimestamp(const GWEN_MSG *msg);
 AQHOME_API void AQH_PingMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText);