diff --git a/apps/aqhome-tool/0BUILD b/apps/aqhome-tool/0BUILD
index 151a413..bb9a4c6 100644
--- a/apps/aqhome-tool/0BUILD
+++ b/apps/aqhome-tool/0BUILD
@@ -35,6 +35,7 @@
     <headers dist="true" >
       ping.h
       flash.h
+      getdevices.h
       utils.h
     </headers>
   
@@ -43,6 +44,7 @@
       main.c
       ping.c
       flash.c
+      getdevices.c
       utils.c
     </sources>
 
diff --git a/apps/aqhome-tool/getdevices.c b/apps/aqhome-tool/getdevices.c
new file mode 100644
index 0000000..f6f02f9
--- /dev/null
+++ b/apps/aqhome-tool/getdevices.c
@@ -0,0 +1,220 @@
+/****************************************************************************
+ * 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.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "./getdevices.h"
+#include "./utils.h"
+
+#include "aqhome/ipc/msg_ipc_getdevices_req.h"
+#include "aqhome/ipc/msg_ipc_getdevices_rsp.h"
+#include "aqhome/ipc/msg_ipc_error.h"
+#include "aqhome/ipc/endpoint_ipc_tcpc.h"
+#include "aqhome/msg/msg_node.h"
+
+#include <gwenhywfar/args.h>
+#include <gwenhywfar/i18n.h>
+#include <gwenhywfar/debug.h>
+#include <gwenhywfar/endpoint_tcpc.h>
+#include <gwenhywfar/text.h>
+
+#include <time.h>
+#include <unistd.h>
+
+
+#define I18S(msg) msg
+#define I18N(msg) GWEN_I18N_Translate(PACKAGE, msg)
+
+
+
+static int _doGetDevices(GWEN_DB_NODE *dbArgs);
+static int _sendGetDevices(GWEN_MSG_ENDPOINT *epTcp);
+
+
+
+int AQH_Tool_GetDevices(GWEN_DB_NODE *dbGlobalArgs, int argc, char **argv)
+{
+  GWEN_DB_NODE *dbLocalArgs;
+  int rv;
+  const GWEN_ARGS args[]= {
+    {
+      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
+      GWEN_ArgsType_Char,           /* type */
+      "tcpAddress",                 /* name */
+      0,                            /* minnum */
+      1,                            /* maxnum */
+      "t",                          /* short option */
+      "tcpaddress",                 /* long option */
+      I18S("Specify TCP address to connect to (defaults to 127.0.0.1)"),
+      I18S("Specify TCP address to connect to (defaults to 127.0.0.1)")
+    },
+    {
+      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
+      GWEN_ArgsType_Int,            /* type */
+      "tcpPort",                    /* name */
+      0,                            /* minnum */
+      1,                            /* maxnum */
+      "P",                          /* short option */
+      "tcpport",                    /* long option */
+      I18S("Specify the TCP port to listen on"),
+      I18S("Specify the TCP port to listen on")
+    },
+    {
+      GWEN_ARGS_FLAGS_HAS_ARGUMENT, /* flags */
+      GWEN_ArgsType_Int,            /* type */
+      "timeout",                    /* name */
+      0,                            /* minnum */
+      1,                            /* maxnum */
+      "T",                          /* short option */
+      NULL,                         /* long option */
+      I18S("Specify timeout in seconds for PONG response"),
+      I18S("Specify timeout in seconds for PONG response")
+    },
+    {
+      GWEN_ARGS_FLAGS_HELP | GWEN_ARGS_FLAGS_LAST, /* flags */
+      GWEN_ArgsType_Int,             /* type */
+      "help",                       /* name */
+      0,                            /* minnum */
+      0,                            /* maxnum */
+      "h",                          /* short option */
+      "help",                       /* long option */
+      "Show this help screen",      /* short description */
+      "Show this help screen"       /* long description */
+    }
+  };
+
+  dbLocalArgs=GWEN_DB_GetGroup(dbGlobalArgs, GWEN_DB_FLAGS_DEFAULT, "local");
+  rv=GWEN_Args_Check(argc, argv, 1,
+                     GWEN_ARGS_MODE_ALLOW_FREEPARAM,
+                     args,
+                     dbLocalArgs);
+  if (rv==GWEN_ARGS_RESULT_ERROR) {
+    fprintf(stderr, "ERROR: Could not parse arguments\n");
+    return 1;
+  }
+  else if (rv==GWEN_ARGS_RESULT_HELP) {
+    GWEN_BUFFER *ubuf;
+
+    ubuf=GWEN_Buffer_new(0, 1024, 0, 1);
+    if (GWEN_Args_Usage(args, ubuf, GWEN_ArgsOutType_Txt)) {
+      fprintf(stderr, "ERROR: Could not create help string\n");
+      return 1;
+    }
+    fprintf(stderr, "%s\n", GWEN_Buffer_GetStart(ubuf));
+    GWEN_Buffer_free(ubuf);
+    return 0;
+  }
+
+  return _doGetDevices(dbLocalArgs);
+}
+
+
+
+int _doGetDevices(GWEN_DB_NODE *dbArgs)
+{
+  GWEN_MSG_ENDPOINT_MGR *emgr;
+  GWEN_MSG_ENDPOINT *epTcp;
+  int rv;
+  int timeoutInSeconds;
+
+  emgr=GWEN_MsgEndpointMgr_new();
+
+  epTcp=Utils_SetupIpcEndpoint(emgr, dbArgs);
+  if (epTcp==NULL) {
+    DBG_ERROR(NULL, "ERROR creating TCP connection");
+    return 2;
+  }
+  GWEN_MsgEndpointMgr_AddEndpoint(emgr, epTcp);
+
+  timeoutInSeconds=GWEN_DB_GetIntValue(dbArgs, "timeout", 0, 5);
+
+  rv=Utils_SendAcceptedMsgGroups(epTcp, 0);
+  if (rv<0) {
+    DBG_INFO(NULL, "here (%d)", rv);
+    return 2;
+  }
+
+  rv=_sendGetDevices(epTcp);
+  if (rv<0) {
+    DBG_INFO(NULL, "here (%d)", rv);
+    return 2;
+  }
+
+  for (;;) {
+    GWEN_MSG *msg;
+    uint16_t code;
+
+    msg=Utils_WaitForSpecificIpcMessage(emgr, epTcp, AQH_MSGTYPE_IPC_GETDEVICES_RSP, timeoutInSeconds);
+    if (msg==NULL) {
+      DBG_INFO(NULL, "No GET_DEVICE response received.");
+      GWEN_MsgEndpointMgr_free(emgr);
+      return 2;
+    }
+    code=GWEN_IpcMsg_GetCode(msg);
+    if (code==AQH_MSGTYPE_IPC_ERROR) {
+      fprintf(stdout, "No device list (%d)\n", AQH_ErrorIpcMsg_GetErrorCode(msg));
+      GWEN_Msg_free(msg);
+      break;
+    }
+    else if (code==AQH_MSGTYPE_IPC_GETDEVICES_RSP) {
+      uint16_t fwVersion;
+      int64_t ts64;
+      GWEN_TIMESTAMP *ts;
+      uint8_t flags;
+
+      flags=AQH_GetDevicesResponseIpcMsg_GetFlags(msg);
+      fwVersion=AQH_GetDevicesResponseIpcMsg_GetFirmwareVersion(msg);
+      ts64=AQH_GetDevicesResponseIpcMsg_GetTimestamp(msg);
+      ts=GWEN_Timestamp_fromInt64(ts64); /* TODO: fix timestamp */
+
+      fprintf(stdout, "- node: %02x (uid=%04x, firmware type=%02x, firmware version=%d.%d, timeStamp: %016lx)\n",
+              AQH_GetDevicesResponseIpcMsg_GetBusAddress(msg),
+              AQH_GetDevicesResponseIpcMsg_GetUid(msg),
+              AQH_GetDevicesResponseIpcMsg_GetFirmwareType(msg),
+              (fwVersion>>8) & 0xff,
+              fwVersion & 0xff,
+              (unsigned long int)ts64);
+      GWEN_Timestamp_free(ts);
+      GWEN_Msg_free(msg);
+      if (flags & AQH_MSGIPC_GETDEVICES_RSP_FLAGS_LAST) {
+        DBG_INFO(NULL, "Last");
+        break;
+      }
+    }
+    else {
+      GWEN_Msg_free(msg);
+      return GWEN_ERROR_GENERIC;
+    }
+  }
+
+  GWEN_MsgEndpointMgr_free(emgr);
+  return 0;
+}
+
+
+
+int _sendGetDevices(GWEN_MSG_ENDPOINT *epTcp)
+{
+  GWEN_MSG *msgOut;
+
+  msgOut=AQH_GetDevicesRequestIpcMsg_new(AQH_MSGTYPE_IPC_GETDEVICES_REQ);
+  if (msgOut==NULL) {
+    DBG_ERROR(NULL, "Error creating message");
+    return GWEN_ERROR_GENERIC;
+  }
+  GWEN_MsgEndpoint_AddSendMessage(epTcp, msgOut);
+  return 0;
+}
+
+
+
+
+
+
diff --git a/apps/aqhome-tool/getdevices.h b/apps/aqhome-tool/getdevices.h
new file mode 100644
index 0000000..e6949d6
--- /dev/null
+++ b/apps/aqhome-tool/getdevices.h
@@ -0,0 +1,20 @@
+/****************************************************************************
+ * 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 AQHOME_TOOL_GETDEVICES_H
+#define AQHOME_TOOL_GETDEVICES_H
+
+
+#include <gwenhywfar/db.h>
+
+
+int AQH_Tool_GetDevices(GWEN_DB_NODE *dbArgs, int argc, char **argv);
+
+
+#endif
+
diff --git a/apps/aqhome-tool/main.c b/apps/aqhome-tool/main.c
index 2345976..2e06669 100644
--- a/apps/aqhome-tool/main.c
+++ b/apps/aqhome-tool/main.c
@@ -12,6 +12,7 @@
 
 #include "./ping.h"
 #include "./flash.h"
+#include "./getdevices.h"
 
 #include <aqhome/api.h>
 #include <aqhome/aqhome.h>
@@ -67,6 +68,7 @@ int main(int argc, char **argv)
   const GWEN_FUNCS cmdDefArray[]= {
     GWEN_FE_DAH("ping", AQH_Tool_Ping, I18N("Ping a given node on the network")),
     GWEN_FE_DAH("flash", AQH_Tool_Flash, I18N("Flash a given node on the network")),
+    GWEN_FE_DAH("getdevices", AQH_Tool_GetDevices, I18N("Request list of known devices on the network")),
     GWEN_FE_END(),
   };
   const GWEN_FUNCS *func;
diff --git a/apps/aqhome-tool/utils.c b/apps/aqhome-tool/utils.c
index 173d668..3fb5973 100644
--- a/apps/aqhome-tool/utils.c
+++ b/apps/aqhome-tool/utils.c
@@ -93,6 +93,47 @@ GWEN_MSG *Utils_WaitForSpecificNodeMessage(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG
 
 
 
+GWEN_MSG *Utils_WaitForSpecificIpcMessage(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *epTcp,
+                                          int msgCode,
+                                          int timeoutInSeconds)
+{
+  time_t startTime;
+
+  startTime=time(NULL);
+
+  for (;;) {
+    GWEN_MSG *msg;
+    time_t now;
+
+    GWEN_MsgEndpointMgr_RunAllEndpoints(emgr);
+    GWEN_MsgEndpointMgr_IoLoopOnce(emgr);
+    msg=GWEN_MsgEndpoint_TakeFirstReceivedMessage(epTcp);
+    if (msg) {
+      uint16_t code;
+
+      code=GWEN_IpcMsg_GetCode(msg);
+      if (code==msgCode) {
+        DBG_INFO(NULL, "Received expected IPC message");
+        return msg;
+      }
+      else if (code==AQH_MSGTYPE_IPC_ERROR) {
+        DBG_INFO(NULL, "Received IPC error message");
+        return msg;
+      }
+      GWEN_Msg_free(msg);
+    }
+    now=time(NULL);
+    if (now-startTime>timeoutInSeconds) {
+      DBG_INFO(NULL, "Timeout");
+      break;
+    }
+  }
+
+  return NULL;
+}
+
+
+
 int Utils_FlushOutMessageQueue(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *epTcp, int timeoutInSeconds)
 {
   time_t startTime;
diff --git a/apps/aqhome-tool/utils.h b/apps/aqhome-tool/utils.h
index f33b611..dcffd0c 100644
--- a/apps/aqhome-tool/utils.h
+++ b/apps/aqhome-tool/utils.h
@@ -22,6 +22,10 @@ GWEN_MSG *Utils_WaitForSpecificNodeMessage(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG
                                            int nodeAddr,
                                            int timeoutInSeconds);
 
+GWEN_MSG *Utils_WaitForSpecificIpcMessage(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *epTcp,
+                                          int msgCode,
+                                          int timeoutInSeconds);
+
 int Utils_FlushOutMessageQueue(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *epTcp, int timeoutInSeconds);
 
 int Utils_SendAcceptedMsgGroups(GWEN_MSG_ENDPOINT *epTcp, uint32_t groups);
diff --git a/aqhome/ipc/0BUILD b/aqhome/ipc/0BUILD
index f9ca1f6..dd84d0f 100644
--- a/aqhome/ipc/0BUILD
+++ b/aqhome/ipc/0BUILD
@@ -53,7 +53,10 @@
       msg_ipc_forward.h
       msg_ipc_value.h
       msg_ipc_ping.h
+      msg_ipc_error.h
       msg_ipc_setaccmsggrps.h
+      msg_ipc_getdevices_req.h
+      msg_ipc_getdevices_rsp.h
     </headers>
 
 
@@ -71,7 +74,10 @@
       msg_ipc_forward.c
       msg_ipc_value.c
       msg_ipc_ping.c
+      msg_ipc_error.c
       msg_ipc_setaccmsggrps.c
+      msg_ipc_getdevices_req.c
+      msg_ipc_getdevices_rsp.c
     </sources>
 
 
diff --git a/aqhome/ipc/msg_ipc.h b/aqhome/ipc/msg_ipc.h
index 4c7790d..50f7086 100644
--- a/aqhome/ipc/msg_ipc.h
+++ b/aqhome/ipc/msg_ipc.h
@@ -24,6 +24,10 @@
 #define AQH_MSGTYPE_IPC_VALUE          0x200
 #define AQH_MSGTYPE_IPC_PING           0x300
 #define AQH_MSGTYPE_IPC_SETACCMSGGRPS  0x400
+#define AQH_MSGTYPE_IPC_GETDEVICES_REQ 0x500
+#define AQH_MSGTYPE_IPC_GETDEVICES_RSP 0x600
+#define AQH_MSGTYPE_IPC_ERROR          0x700
+
 
 
 
diff --git a/aqhome/ipc/msg_ipc_error.c b/aqhome/ipc/msg_ipc_error.c
new file mode 100644
index 0000000..65d40ec
--- /dev/null
+++ b/aqhome/ipc/msg_ipc_error.c
@@ -0,0 +1,74 @@
+/****************************************************************************
+ * 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.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <aqhome/ipc/msg_ipc_error.h>
+
+#include <gwenhywfar/msg.h>
+#include <gwenhywfar/buffer.h>
+
+#include <gwenhywfar/misc.h>
+#include <gwenhywfar/list.h>
+#include <gwenhywfar/error.h>
+#include <gwenhywfar/debug.h>
+#include <gwenhywfar/text.h>
+#include <gwenhywfar/msg_ipc.h>
+
+
+#define AQH_MSGIPC_ERROR_OFFS_ERRORCODE   0   /* 2 bytes */
+
+#define AQH_MSGIPC_ERROR_MINSIZE          (GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_ERROR_OFFS_ERRORCODE+2)
+
+
+
+
+GWEN_MSG *AQH_ErrorIpcMsg_new(uint16_t code, uint16_t errorCode)
+{
+  GWEN_MSG *msg;
+  uint8_t *ptr;
+
+  msg=GWEN_IpcMsg_new(AQH_IPC_PROTOCOL_ID, AQH_IPC_PROTOCOL_VERSION, code, AQH_MSGIPC_ERROR_MINSIZE, NULL);
+  ptr=GWEN_Msg_GetBuffer(msg);
+  ptr[GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_ERROR_OFFS_ERRORCODE+0]=errorCode & 0xff;
+  ptr[GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_ERROR_OFFS_ERRORCODE+1]=errorCode & 0xff;
+
+  return msg;
+}
+
+
+
+uint16_t AQH_ErrorIpcMsg_GetErrorCode(const GWEN_MSG *msg)
+{
+  return GWEN_Msg_GetUint16At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_ERROR_OFFS_ERRORCODE, 0);
+}
+
+
+
+
+
+void AQH_ErrorIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText)
+{
+  if (GWEN_Msg_GetBytesInBuffer(msg)>=AQH_MSGIPC_ERROR_MINSIZE) {
+    GWEN_Buffer_AppendArgs(dbuf,
+                           "ERROR (code=%d, proto=%d, proto version=%d, error=%d)\n",
+                           GWEN_IpcMsg_GetCode(msg),
+                           GWEN_IpcMsg_GetProtoId(msg),
+                           GWEN_IpcMsg_GetProtoVersion(msg),
+                           AQH_ErrorIpcMsg_GetErrorCode(msg));
+  }
+}
+
+
+
+
+
+
+
diff --git a/aqhome/ipc/msg_ipc_error.h b/aqhome/ipc/msg_ipc_error.h
new file mode 100644
index 0000000..fdc2c5f
--- /dev/null
+++ b/aqhome/ipc/msg_ipc_error.h
@@ -0,0 +1,33 @@
+/****************************************************************************
+ * 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_ERROR_H
+#define AQH_MSG_IPC_ERROR_H
+
+
+#include <aqhome/api.h>
+#include <aqhome/ipc/msg_ipc.h>
+#include <aqhome/msg/msg_node.h>
+
+#include <gwenhywfar/msg.h>
+#include <gwenhywfar/buffer.h>
+
+
+#define AQH_MSG_IPC_ERROR_OK     0
+#define AQH_MSG_IPC_ERROR_NODATA 1
+
+
+AQHOME_API GWEN_MSG *AQH_ErrorIpcMsg_new(uint16_t code, uint16_t errorCode);
+AQHOME_API uint16_t AQH_ErrorIpcMsg_GetErrorCode(const GWEN_MSG *msg);
+AQHOME_API void AQH_ErrorIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText);
+
+
+#endif
+
+
+
diff --git a/aqhome/ipc/msg_ipc_getdevices_req.c b/aqhome/ipc/msg_ipc_getdevices_req.c
new file mode 100644
index 0000000..7fd508c
--- /dev/null
+++ b/aqhome/ipc/msg_ipc_getdevices_req.c
@@ -0,0 +1,52 @@
+/****************************************************************************
+ * 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.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <aqhome/ipc/msg_ipc_getdevices_req.h>
+
+#include <gwenhywfar/msg.h>
+#include <gwenhywfar/buffer.h>
+
+#include <gwenhywfar/misc.h>
+#include <gwenhywfar/list.h>
+#include <gwenhywfar/error.h>
+#include <gwenhywfar/debug.h>
+#include <gwenhywfar/text.h>
+#include <gwenhywfar/msg_ipc.h>
+
+
+#define AQH_MSGIPC_GETDEVICES_REQ_MINSIZE          (GWEN_MSGIPC_OFFS_PAYLOAD)
+
+
+
+
+GWEN_MSG *AQH_GetDevicesRequestIpcMsg_new(uint16_t code)
+{
+  return GWEN_IpcMsg_new(AQH_IPC_PROTOCOL_ID, AQH_IPC_PROTOCOL_VERSION, code, AQH_MSGIPC_GETDEVICES_REQ_MINSIZE, NULL);
+}
+
+
+
+void AQH_GetDevicesRequestIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText)
+{
+  if (GWEN_Msg_GetBytesInBuffer(msg)>=AQH_MSGIPC_GETDEVICES_REQ_MINSIZE) {
+    GWEN_Buffer_AppendArgs(dbuf,
+                           "GET_DEVICES REQ (code=%d, proto=%d, proto version=%d)\n",
+                           GWEN_IpcMsg_GetCode(msg),
+                           GWEN_IpcMsg_GetProtoId(msg),
+                           GWEN_IpcMsg_GetProtoVersion(msg));
+  }
+}
+
+
+
+
+
diff --git a/aqhome/ipc/msg_ipc_getdevices_req.h b/aqhome/ipc/msg_ipc_getdevices_req.h
new file mode 100644
index 0000000..7de7a97
--- /dev/null
+++ b/aqhome/ipc/msg_ipc_getdevices_req.h
@@ -0,0 +1,27 @@
+/****************************************************************************
+ * 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_MSGIPC_GETDEVICES_REQ_H
+#define AQH_MSGIPC_GETDEVICES_REQ_H
+
+
+#include <aqhome/api.h>
+#include <aqhome/ipc/msg_ipc.h>
+
+#include <gwenhywfar/msg.h>
+#include <gwenhywfar/buffer.h>
+
+
+AQHOME_API GWEN_MSG *AQH_GetDevicesRequestIpcMsg_new(uint16_t code);
+
+AQHOME_API void AQH_GetDevicesRequestIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText);
+
+
+
+#endif
+
diff --git a/aqhome/ipc/msg_ipc_getdevices_rsp.c b/aqhome/ipc/msg_ipc_getdevices_rsp.c
new file mode 100644
index 0000000..7845b44
--- /dev/null
+++ b/aqhome/ipc/msg_ipc_getdevices_rsp.c
@@ -0,0 +1,162 @@
+/****************************************************************************
+ * 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.
+ ****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <aqhome/ipc/msg_ipc_getdevices_rsp.h>
+
+#include <gwenhywfar/msg.h>
+#include <gwenhywfar/buffer.h>
+
+#include <gwenhywfar/misc.h>
+#include <gwenhywfar/list.h>
+#include <gwenhywfar/error.h>
+#include <gwenhywfar/debug.h>
+#include <gwenhywfar/text.h>
+#include <gwenhywfar/msg_ipc.h>
+
+
+#define AQH_MSGIPC_GETDEVICES_RSP_OFFS_FLAGS     0   /* 1 bytes */
+#define AQH_MSGIPC_GETDEVICES_RSP_OFFS_BUSADDR   1   /* 1 bytes */
+#define AQH_MSGIPC_GETDEVICES_RSP_OFFS_UID       2   /* 4 bytes */
+#define AQH_MSGIPC_GETDEVICES_RSP_OFFS_FWTYPE    6   /* 2 bytes */
+#define AQH_MSGIPC_GETDEVICES_RSP_OFFS_FWVER     8   /* 2 bytes */
+#define AQH_MSGIPC_GETDEVICES_RSP_OFFS_MODULES  10   /* 2 bytes */
+#define AQH_MSGIPC_GETDEVICES_RSP_OFFS_LASTCHG  12   /* 8 bytes */
+
+
+#define AQH_MSGIPC_GETDEVICES_RSP_MINSIZE          (GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_LASTCHG+8)
+
+
+
+
+GWEN_MSG *AQH_GetDevicesResponseIpcMsg_new(uint16_t code, uint8_t flags, const AQH_NODE_INFO *ni)
+{
+  GWEN_MSG *msg;
+  uint8_t *ptr;
+  uint32_t u32;
+  uint64_t u64=0;
+  const GWEN_TIMESTAMP *t;
+
+  msg=GWEN_IpcMsg_new(AQH_IPC_PROTOCOL_ID, AQH_IPC_PROTOCOL_VERSION, code, AQH_MSGIPC_GETDEVICES_RSP_MINSIZE, NULL);
+  ptr=GWEN_Msg_GetBuffer(msg)+GWEN_MSGIPC_OFFS_PAYLOAD;
+
+  *(ptr++)=flags & 0xff;
+
+  *(ptr++)=AQH_NodeInfo_GetBusAddress(ni);
+
+  u32=AQH_NodeInfo_GetUid(ni);
+  *(ptr++)=u32 & 0xff;
+  *(ptr++)=(u32>>8) & 0xff;
+  *(ptr++)=(u32>>16) & 0xff;
+  *(ptr++)=(u32>>24) & 0xff;
+
+  u32=AQH_NodeInfo_GetFirmwareType(ni);
+  *(ptr++)=u32 & 0xff;
+  *(ptr++)=(u32>>8) & 0xff;
+
+  u32=AQH_NodeInfo_GetFirmwareVersion(ni);
+  *(ptr++)=u32 & 0xff;
+  *(ptr++)=(u32>>8) & 0xff;
+
+  u32=AQH_NodeInfo_GetModules(ni);
+  *(ptr++)=u32 & 0xff;
+  *(ptr++)=(u32>>8) & 0xff;
+
+  t=AQH_NodeInfo_GetTimestampLastChange(ni);
+  if (t)
+    u64=(uint64_t)GWEN_Timestamp_toInt64(t);
+  *(ptr++)=u64 & 0xff;
+  *(ptr++)=(u64>>8) & 0xff;
+  *(ptr++)=(u64>>16) & 0xff;
+  *(ptr++)=(u64>>24) & 0xff;
+  *(ptr++)=(u64>>32) & 0xff;
+  *(ptr++)=(u64>>40) & 0xff;
+  *(ptr++)=(u64>>48) & 0xff;
+  *(ptr++)=(u64>>56) & 0xff;
+
+  return msg;
+}
+
+
+
+uint8_t AQH_GetDevicesResponseIpcMsg_GetFlags(const GWEN_MSG *msg)
+{
+  return GWEN_Msg_GetUint8At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_FLAGS, 0);
+}
+
+
+
+uint8_t AQH_GetDevicesResponseIpcMsg_GetBusAddress(const GWEN_MSG *msg)
+{
+  return GWEN_Msg_GetUint16At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_BUSADDR, 0);
+}
+
+
+
+uint32_t AQH_GetDevicesResponseIpcMsg_GetUid(const GWEN_MSG *msg)
+{
+  return GWEN_Msg_GetUint32At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_UID, 0);
+}
+
+
+
+uint16_t AQH_GetDevicesResponseIpcMsg_GetFirmwareType(const GWEN_MSG *msg)
+{
+  return GWEN_Msg_GetUint16At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_FWTYPE, 0);
+}
+
+
+
+uint16_t AQH_GetDevicesResponseIpcMsg_GetFirmwareVersion(const GWEN_MSG *msg)
+{
+  return GWEN_Msg_GetUint16At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_FWVER, 0);
+}
+
+
+
+uint16_t AQH_GetDevicesResponseIpcMsg_GetModules(const GWEN_MSG *msg)
+{
+  return GWEN_Msg_GetUint16At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_MODULES, 0);
+}
+
+
+
+int64_t AQH_GetDevicesResponseIpcMsg_GetTimestamp(const GWEN_MSG *msg)
+{
+  uint64_t v;
+
+  v=(uint64_t) GWEN_Msg_GetUint32At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_LASTCHG, 0);
+  v|=((uint64_t)GWEN_Msg_GetUint32At(msg, GWEN_MSGIPC_OFFS_PAYLOAD+AQH_MSGIPC_GETDEVICES_RSP_OFFS_LASTCHG+4, 0))<<32;
+  return (int64_t) v;
+}
+
+
+
+void AQH_GetDevicesResponseIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText)
+{
+  if (GWEN_Msg_GetBytesInBuffer(msg)>=AQH_MSGIPC_GETDEVICES_RSP_MINSIZE) {
+    GWEN_Buffer_AppendArgs(dbuf,
+                           "GET_DEVICES_RSP (code=%d, proto=%d, proto version=%d, uid=0x%08x, bus addr=0x%02x, flags=0x%02x)\n",
+                           GWEN_IpcMsg_GetCode(msg),
+                           GWEN_IpcMsg_GetProtoId(msg),
+                           GWEN_IpcMsg_GetProtoVersion(msg),
+                           (unsigned int) AQH_GetDevicesResponseIpcMsg_GetUid(msg),
+                           AQH_GetDevicesResponseIpcMsg_GetBusAddress(msg),
+                           AQH_GetDevicesResponseIpcMsg_GetFlags(msg));
+  }
+}
+
+
+
+
+
+
+
diff --git a/aqhome/ipc/msg_ipc_getdevices_rsp.h b/aqhome/ipc/msg_ipc_getdevices_rsp.h
new file mode 100644
index 0000000..bf1a8fd
--- /dev/null
+++ b/aqhome/ipc/msg_ipc_getdevices_rsp.h
@@ -0,0 +1,40 @@
+/****************************************************************************
+ * 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_MSGIPC_GETDEVICES_RSP_H
+#define AQH_MSGIPC_GETDEVICES_RSP_H
+
+
+#include <aqhome/api.h>
+#include <aqhome/ipc/msg_ipc.h>
+#include <aqhome/nodes/nodeinfo.h>
+
+#include <gwenhywfar/msg.h>
+#include <gwenhywfar/buffer.h>
+
+
+#define AQH_MSGIPC_GETDEVICES_RSP_FLAGS_LAST 0x01
+
+
+AQHOME_API GWEN_MSG *AQH_GetDevicesResponseIpcMsg_new(uint16_t code, uint8_t flags, const AQH_NODE_INFO *ni);
+
+AQHOME_API uint8_t AQH_GetDevicesResponseIpcMsg_GetFlags(const GWEN_MSG *msg);
+AQHOME_API uint8_t AQH_GetDevicesResponseIpcMsg_GetBusAddress(const GWEN_MSG *msg);
+
+AQHOME_API uint32_t AQH_GetDevicesResponseIpcMsg_GetUid(const GWEN_MSG *msg);
+AQHOME_API uint16_t AQH_GetDevicesResponseIpcMsg_GetFirmwareType(const GWEN_MSG *msg);
+AQHOME_API uint16_t AQH_GetDevicesResponseIpcMsg_GetFirmwareVersion(const GWEN_MSG *msg);
+AQHOME_API uint16_t AQH_GetDevicesResponseIpcMsg_GetModules(const GWEN_MSG *msg);
+AQHOME_API int64_t AQH_GetDevicesResponseIpcMsg_GetTimestamp(const GWEN_MSG *msg);
+
+AQHOME_API void AQH_GetDevicesResponseIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText);
+
+
+
+#endif
+
diff --git a/aqhome/ipc/msg_ipc_value.h b/aqhome/ipc/msg_ipc_value.h
index 2af8a69..1bd85e4 100644
--- a/aqhome/ipc/msg_ipc_value.h
+++ b/aqhome/ipc/msg_ipc_value.h
@@ -32,6 +32,8 @@ AQHOME_API int16_t AQH_ValueIpcMsg_GetValueNom(const GWEN_MSG *msg);
 AQHOME_API int16_t AQH_ValueIpcMsg_GetValueDenom(const GWEN_MSG *msg);
 AQHOME_API double AQH_ValueIpcMsg_GetValueAsDouble(const GWEN_MSG *msg);
 
+AQHOME_API void AQH_ValueIpcMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText);
+
 
 #endif
 
diff --git a/aqhome/msgmanager.c b/aqhome/msgmanager.c
index 89e2257..9b62140 100644
--- a/aqhome/msgmanager.c
+++ b/aqhome/msgmanager.c
@@ -22,6 +22,7 @@
 #include "aqhome/msg/msg_haveaddr.h"
 #include "aqhome/msg/msg_device.h"
 #include "aqhome/msg/msg_ping.h"
+#include "aqhome/msg/msg_flashready.h"
 #include "aqhome/msg/endpoint_tty.h"
 #include "aqhome/msg/endpoint_node.h"
 #include "aqhome/mqtt/endpoint_mqttc.h"
@@ -29,6 +30,8 @@
 #include "aqhome/ipc/msg_ipc_ping.h"
 #include "aqhome/ipc/msg_ipc_setaccmsggrps.h"
 #include "aqhome/ipc/msg_ipc_forward.h"
+#include "aqhome/ipc/msg_ipc_getdevices_rsp.h"
+#include "aqhome/ipc/msg_ipc_error.h"
 
 #include <gwenhywfar/endpoint_tcpc.h>
 #include <gwenhywfar/endpoint_connectable.h>
@@ -54,12 +57,15 @@ static void _handleMsgHaveAddress(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT
 static void _handleMsgComSendStat(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
 static void _handleMsgComRecvStat(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
 static void _handleMsgDevice(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
+static void _handleMsgFlashReady(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
 
 static void _handleIpcMsgPing(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
 static void _handleIpcMsgSetAccMsgGrps(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
 static void _handleIpcMsgForward(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
+static void _handleIpcMsgGetDevicesReq(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg);
 
 static AQH_NODE_INFO *_getOrCreateNodeAndUpdateUidAddr(GWEN_MSG_ENDPOINT_MGR *emgr, const GWEN_MSG *msg, uint32_t uid);
+static void _updateTimestampLastChange(AQH_NODE_INFO *ni);
 
 
 
@@ -230,6 +236,7 @@ void _handleNodeMsg(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GW
       case AQH_MSG_TYPE_CLAIM_ADDRESS: _handleMsgClaimAddress(emgr, ep, msg); break;
       case AQH_MSG_TYPE_HAVE_ADDRESS:  _handleMsgHaveAddress(emgr, ep, msg); break;
       case AQH_MSG_TYPE_DEVICE:        _handleMsgDevice(emgr, ep, msg); break;
+      case AQH_MSG_TYPE_FLASH_READY:   _handleMsgFlashReady(emgr, ep, msg); break;
       default:                         break;
     }
   }
@@ -245,10 +252,11 @@ void _handleIpcMsg(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWE
   code=GWEN_IpcMsg_GetCode(msg);
   DBG_ERROR(AQH_LOGDOMAIN, "Received IPC packet");
   switch(code) {
-  case AQH_MSGTYPE_IPC_PING:          _handleIpcMsgPing(emgr, ep, msg); break;
-  case AQH_MSGTYPE_IPC_SETACCMSGGRPS: _handleIpcMsgSetAccMsgGrps(emgr, ep, msg); break;
+  case AQH_MSGTYPE_IPC_PING:           _handleIpcMsgPing(emgr, ep, msg); break;
+  case AQH_MSGTYPE_IPC_SETACCMSGGRPS:  _handleIpcMsgSetAccMsgGrps(emgr, ep, msg); break;
   case AQH_MSGTYPE_IPC_FORWARD:        _handleIpcMsgForward(emgr, ep, msg); break;
-  default:                   break;
+  case AQH_MSGTYPE_IPC_GETDEVICES_REQ: _handleIpcMsgGetDevicesReq(emgr, ep, msg); break;
+  default:                              break;
   }
 }
 
@@ -301,6 +309,46 @@ void _handleIpcMsgForward(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, co
 
 
 
+void _handleIpcMsgGetDevicesReq(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg)
+{
+  AQH_MSG_MANAGER *xmgr;
+
+  xmgr=GWEN_INHERIT_GETDATA(GWEN_MSG_ENDPOINT_MGR, AQH_MSG_MANAGER, emgr);
+  if (xmgr) {
+    AQH_NODE_INFO_LIST *nodeInfoList;
+
+    DBG_ERROR(AQH_LOGDOMAIN, "Received IPC GetDevicesRequest message");
+    nodeInfoList=AQH_NodeDb_GetAllNodeInfos(xmgr->nodeDb);
+    if (nodeInfoList && AQH_NodeInfo_List_GetCount(nodeInfoList)) {
+      const AQH_NODE_INFO *ni;
+
+      ni=AQH_NodeInfo_List_First(nodeInfoList);
+      while(ni) {
+        const AQH_NODE_INFO *niNext;
+        GWEN_MSG *msgOut;
+
+        niNext=AQH_NodeInfo_List_Next(ni);
+        DBG_INFO(AQH_LOGDOMAIN, "Sending response for node %02x (%08x)", AQH_NodeInfo_GetBusAddress(ni), AQH_NodeInfo_GetUid(ni));
+        msgOut=AQH_GetDevicesResponseIpcMsg_new(AQH_MSGTYPE_IPC_GETDEVICES_RSP, niNext?0:AQH_MSGIPC_GETDEVICES_RSP_FLAGS_LAST, ni);
+        GWEN_MsgEndpoint_AddSendMessage(ep, msgOut);
+        ni=niNext;
+      }
+    }
+    else {
+      GWEN_MSG *msgOut;
+
+      DBG_INFO(AQH_LOGDOMAIN, "No nodes");
+      msgOut=AQH_ErrorIpcMsg_new(AQH_MSGTYPE_IPC_ERROR, AQH_MSG_IPC_ERROR_NODATA);
+      GWEN_MsgEndpoint_AddSendMessage(ep, msgOut);
+    }
+  }
+}
+
+
+
+
+
+
 void _handleMsgValue2(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg)
 {
   AQH_MSG_MANAGER *xmgr;
@@ -395,6 +443,7 @@ void _handleMsgComSendStat(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, c
     AQH_NodeInfo_SetStatsCollisions(ni, AQH_SendStatsMsg_GetCollisions(msg));
     AQH_NodeInfo_SetStatsBusy(ni, AQH_SendStatsMsg_GetBusyErrors(msg));
     AQH_NodeDb_SetModified(xmgr->nodeDb);
+    _updateTimestampLastChange(ni);
   }
 }
 
@@ -418,6 +467,7 @@ void _handleMsgComRecvStat(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, c
     AQH_NodeInfo_SetStatsCrcErrors(ni, AQH_RecvStatsMsg_GetCrcErrors(msg));
     AQH_NodeInfo_SetStatsIoErrors(ni, AQH_RecvStatsMsg_GetIoErrors(msg));
     AQH_NodeDb_SetModified(xmgr->nodeDb);
+    _updateTimestampLastChange(ni);
   }
 }
 
@@ -438,6 +488,32 @@ void _handleMsgDevice(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const
       AQH_NodeInfo_SetFirmwareType(ni, AQH_DeviceMsg_GetFirmwareType(msg));
       AQH_NodeInfo_SetFirmwareVersion(ni, (AQH_DeviceMsg_GetFirmwareHigh(msg)<<8) | AQH_DeviceMsg_GetFirmwareLow(msg));
       AQH_NodeInfo_SetModules(ni, AQH_DeviceMsg_GetModuleMask(msg));
+      _updateTimestampLastChange(ni);
+      AQH_NodeDb_SetModified(xmgr->nodeDb);
+    }
+    else {
+      DBG_INFO(AQH_LOGDOMAIN, "Error handling message");
+    }
+  }
+}
+
+
+
+void _handleMsgFlashReady(GWEN_MSG_ENDPOINT_MGR *emgr, GWEN_MSG_ENDPOINT *ep, const GWEN_MSG *msg)
+{
+  AQH_MSG_MANAGER *xmgr;
+
+  xmgr=GWEN_INHERIT_GETDATA(GWEN_MSG_ENDPOINT_MGR, AQH_MSG_MANAGER, emgr);
+  if (xmgr) {
+    AQH_NODE_INFO *ni;
+    uint32_t uid;
+
+    uid=AQH_FlashReadyMsg_GetUid(msg);
+    ni=_getOrCreateNodeAndUpdateUidAddr(emgr, msg, uid);
+    if (ni) {
+      AQH_NodeInfo_SetFirmwareType(ni, AQH_FlashReadyMsg_GetFirmwareType(msg));
+      AQH_NodeInfo_SetFirmwareVersion(ni, AQH_FlashReadyMsg_GetFirmwareVersion(msg));
+      _updateTimestampLastChange(ni);
       AQH_NodeDb_SetModified(xmgr->nodeDb);
     }
     else {
@@ -465,7 +541,8 @@ AQH_NODE_INFO *_getOrCreateNodeAndUpdateUidAddr(GWEN_MSG_ENDPOINT_MGR *emgr, con
       storedBusAddr=AQH_NodeInfo_GetBusAddress(ni);
       if (busAddr!=0 && storedBusAddr!=busAddr) {
         DBG_INFO(AQH_LOGDOMAIN, "Changed busaddr for %08x from %02x to %02x", uid, storedBusAddr, busAddr);
-        AQH_NodeInfo_SetBusAddress(ni, busAddr);
+	AQH_NodeInfo_SetBusAddress(ni, busAddr);
+	_updateTimestampLastChange(ni);
         AQH_NodeDb_SetModified(xmgr->nodeDb);
       }
     }
@@ -475,6 +552,7 @@ AQH_NODE_INFO *_getOrCreateNodeAndUpdateUidAddr(GWEN_MSG_ENDPOINT_MGR *emgr, con
       ni=AQH_NodeInfo_new();
       AQH_NodeInfo_SetBusAddress(ni, busAddr);
       AQH_NodeInfo_SetUid(ni, uid);
+      _updateTimestampLastChange(ni);
       rv=AQH_NodeDb_AddNodeInfo(xmgr->nodeDb, ni);
       if (rv<0) {
         DBG_INFO(AQH_LOGDOMAIN, "here (%d)", rv);
@@ -492,6 +570,17 @@ AQH_NODE_INFO *_getOrCreateNodeAndUpdateUidAddr(GWEN_MSG_ENDPOINT_MGR *emgr, con
 
 
 
+void _updateTimestampLastChange(AQH_NODE_INFO *ni)
+{
+  GWEN_TIMESTAMP *t;
+
+  t=GWEN_Timestamp_NowInLocalTime();
+  AQH_NodeInfo_SetTimestampLastChange(ni, t);
+  GWEN_Timestamp_free(t);
+}
+
+
+