Heavy work on IPC.

We will now have a broker (aqhome-data) which stores data and distributes
value change messages among connected clients.
aqhomed will connect to that broker and send its values there.
aqhome-mqtt will also connect to the broker and send its values there.
Other clients can later connect to check for changes and react according
to rules.

aqhome/ipc/data/msg_data_connect.h

@@ -0,0 +1,50 @@
+/****************************************************************************
+ * This file is part of the project AqHome.
+ * AqHome (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_MSG_IPC_DATA_CONNECT_H
+#define AQH_MSG_IPC_DATA_CONNECT_H
+
+
+#include <aqhome/api.h>
+
+#include <aqhome/data/value.h>
+
+#include <gwenhywfar/msg_ipc.h>
+
+
+/**
+ * This message is used in request AQH_MSGTYPE_IPC_DATA_ADDVALUES_REQ and in response AQH_MSGTYPE_IPC_DATA_GETVALUES_RSP.
+ */
+
+#define AQH_MSGDATA_CONNECT_TAGS_CLIENTID 0x0001
+#define AQH_MSGDATA_CONNECT_TAGS_USERID   0x0002
+#define AQH_MSGDATA_CONNECT_TAGS_PASSWORD 0x0003
+#define AQH_MSGDATA_CONNECT_TAGS_FLAGS    0x0004
+
+#define AQH_MSGDATA_CONNECT_FLAGS_WANTUPDATES 0x0001
+
+
+
+AQHOME_API GWEN_MSG *AQH_ConnectDataIpcMsg_new(uint16_t code,
+                                               const char *clientId,
+                                               const char *userId, const char *password,
+                                               uint32_t flags);
+
+AQHOME_API int AQH_ConnectDataIpcMsg_IsValid(const GWEN_MSG *msg);
+AQHOME_API void AQH_ConnectDataIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText);
+
+
+
+
+
+
+
+#endif
+
+
+