diff --git a/common/utils/T/Makefile b/common/utils/T/Makefile
index 9694273c1965e77e5338ba61871dbe82edb87c14..6690e7d38dd9e79124727f967f9b7f5494111fc2 100644
--- a/common/utils/T/Makefile
+++ b/common/utils/T/Makefile
@@ -24,11 +24,16 @@ $(PROG): $(OBJS)
 %.o: %.c
 	$(CC) $(CFLAGS) -c -o $@ $<
 
+T.o: T_messages.txt.h
+
+T_messages.txt.h: T_messages.txt
+	xxd -i T_messages.txt > T_messages.txt.h
+
 T_IDs.h: $(GENIDS) T_messages.txt
 	./$(GENIDS) T_messages.txt T_IDs.h
 
 main.o: T.h T_IDs.h T_defs.h
 
 clean:
-	rm -f *.o $(PROG) $(GENIDS) core T_IDs.h
+	rm -f *.o $(PROG) $(GENIDS) core T_IDs.h T_messages.txt.h
 	cd tracer && make clean
diff --git a/common/utils/T/T.c b/common/utils/T/T.c
index 541cd239b788c0cd6fdc1ef91616472f1e77046f..1a5ff0a54c9ba12e130783f8555705939d38192f 100644
--- a/common/utils/T/T.c
+++ b/common/utils/T/T.c
@@ -1,4 +1,5 @@
 #include "T.h"
+#include "T_messages.txt.h"
 #include <string.h>
 #include <netinet/ip.h>
 #include <arpa/inet.h>
@@ -125,6 +126,8 @@ void T_connect_to_tracer(char *addr, int port)
 #ifdef T_USE_SHARED_MEMORY
   int T_shm_fd;
 #endif
+  unsigned char *buf;
+  int len;
 
   if (strcmp(addr, "127.0.0.1") != 0) {
     printf("error: local tracer must be on same host\n");
@@ -169,4 +172,29 @@ again:
   new_thread(T_send_thread, NULL);
 #endif
   new_thread(T_receive_thread, NULL);
+
+  /* trace T_message.txt
+   * Send several messages -1 with content followed by message -2.
+   * We can't use the T macro directly, events -1 and -2 are special.
+   */
+  buf = T_messages_txt;
+  len = T_messages_txt_len;
+  while (len) {
+    int send_size = len;
+    if (send_size > T_PAYLOAD_MAXSIZE - sizeof(int))
+      send_size = T_PAYLOAD_MAXSIZE - sizeof(int);
+    do {
+      T_LOCAL_DATA
+      T_HEADER(T_ID(-1));
+      T_PUT_buffer(1, ((T_buffer){addr:(buf), length:(len)}));
+      T_SEND();
+    } while (0);
+    buf += send_size;
+    len -= send_size;
+  }
+  do {
+    T_LOCAL_DATA
+    T_HEADER(T_ID(-2));
+    T_SEND();
+  } while (0);
 }
diff --git a/common/utils/T/T_defs.h b/common/utils/T/T_defs.h
index ffd35ad9afd56da6dc00ff352ff2f3b7ac360c81..b4fd47c0a5134f64257ef781f6a0daf9182182e9 100644
--- a/common/utils/T/T_defs.h
+++ b/common/utils/T/T_defs.h
@@ -13,6 +13,13 @@
 /* size of the local cache for messages (must be pow(2,something)) */
 #define T_CACHE_SIZE (8192 * 2)
 
+/* maximum number of bytes a message can contain */
+#ifdef T_SEND_TIME
+#  define T_PAYLOAD_MAXSIZE (T_BUFFER_MAX-sizeof(int)-sizeof(struct timespec))
+#else
+#  define T_PAYLOAD_MAXSIZE (T_BUFFER_MAX-sizeof(int))
+#endif
+
 typedef struct {
   volatile int busy;
   char buffer[T_BUFFER_MAX];
diff --git a/common/utils/T/tracer/Makefile b/common/utils/T/tracer/Makefile
index 8cbc0d58d2b3031f773c97d691db90b64eb72b24..5044c2e8b36f416d8f3a72f0026c22b34f6daf24 100644
--- a/common/utils/T/tracer/Makefile
+++ b/common/utils/T/tracer/Makefile
@@ -4,7 +4,7 @@ local:
 	make -f Makefile.local
 
 remote:
-	make -f Makefile.remote tracer_remote textlog enb vcd
+	make -f Makefile.remote textlog enb vcd
 
 clean:
 	make -f Makefile.local clean
diff --git a/common/utils/T/tracer/Makefile.remote b/common/utils/T/tracer/Makefile.remote
index b6ff0f3cad60c397979cbb2fbc869fb8709a419f..b2663f8651449c9c37826d21a6e6a2727b854174 100644
--- a/common/utils/T/tracer/Makefile.remote
+++ b/common/utils/T/tracer/Makefile.remote
@@ -5,15 +5,15 @@ CFLAGS=-Wall -g -pthread -DT_TRACER -I.
 
 LIBS=-lX11 -lm -lpng -lXft
 
-textlog: utils.o textlog.o database.o event.o handler.o \
+textlog: utils.o textlog.o database.o event.o handler.o config.o \
          event_selector.o view/view.a gui/gui.a logger/logger.a
 	$(CC) $(CFLAGS) -o textlog $^ $(LIBS)
 
-enb: utils.o enb.o database.o event.o handler.o \
+enb: utils.o enb.o database.o event.o handler.o config.o \
          event_selector.o view/view.a gui/gui.a logger/logger.a
 	$(CC) $(CFLAGS) -o enb $^ $(LIBS)
 
-vcd: utils.o vcd.o database.o event.o handler.o \
+vcd: utils.o vcd.o database.o event.o handler.o config.o \
          event_selector.o view/view.a gui/gui.a logger/logger.a
 	$(CC) $(CFLAGS) -o vcd $^ $(LIBS)
 
diff --git a/common/utils/T/tracer/config.c b/common/utils/T/tracer/config.c
new file mode 100644
index 0000000000000000000000000000000000000000..333c28ce431a493ca05486d23656e1fbd627fa8b
--- /dev/null
+++ b/common/utils/T/tracer/config.c
@@ -0,0 +1,55 @@
+#include "config.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static char *local;
+static int local_size;
+static char *remote;
+static int remote_size;
+
+static char *PUT(char *to, int tosize, char c)
+{
+  if ((tosize & 4095) == 0) {
+    to = realloc(to, tosize + 4096); if (to == NULL) abort();
+  }
+  to[tosize] = c;
+  return to;
+}
+
+void append_received_config_chunk(char *buf, int length)
+{
+  int buflen = *(int *)buf;
+  if (buflen != length - sizeof(int)) {
+    printf("ERROR: bad trace -1, should not happen...\n");
+    abort();
+  }
+  buf += sizeof(int);
+  while (buflen) {
+    remote = PUT(remote, remote_size, *buf);
+    remote_size++;
+    buf++;
+    buflen--;
+  }
+}
+
+void store_config_file(char *filename)
+{
+  int c;
+  FILE *f = fopen(filename, "r");
+  if (f == NULL) { perror(filename); abort(); }
+  while (1) {
+    c = fgetc(f); if (c == EOF) break;
+    local = PUT(local, local_size, c);
+    local_size++;
+  }
+  fclose(f);
+}
+
+void verify_config(void)
+{
+  if (local_size != remote_size || memcmp(local, remote, local_size) != 0) {
+    printf("ERROR: local and remote T_messages.txt not identical\n");
+    abort();
+  }
+}
diff --git a/common/utils/T/tracer/config.h b/common/utils/T/tracer/config.h
new file mode 100644
index 0000000000000000000000000000000000000000..88b207e9f6345f596981fd1d7fb23ed3d26b0550
--- /dev/null
+++ b/common/utils/T/tracer/config.h
@@ -0,0 +1,8 @@
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+void append_received_config_chunk(char *buf, int length);
+void store_config_file(char *filename);
+void verify_config(void);
+
+#endif /* _CONFIG_H_ */
diff --git a/common/utils/T/tracer/enb.c b/common/utils/T/tracer/enb.c
index 239c2d8ad8021f45a89136aa28faa28b7f5c539c..97ff6f490f7f153c2a019b1e2a98b9121258c57f 100644
--- a/common/utils/T/tracer/enb.c
+++ b/common/utils/T/tracer/enb.c
@@ -1,8 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
 #include <unistd.h>
 #include "database.h"
 #include "event.h"
@@ -14,39 +12,10 @@
 #include "../T_defs.h"
 #include "event_selector.h"
 #include "openair_logo.h"
+#include "config.h"
 
 #define DEFAULT_REMOTE_PORT 2021
 
-int get_connection(char *addr, int port)
-{
-  struct sockaddr_in a;
-  socklen_t alen;
-  int s, t;
-
-  printf("waiting for connection on %s:%d\n", addr, port);
-
-  s = socket(AF_INET, SOCK_STREAM, 0);
-  if (s == -1) { perror("socket"); exit(1); }
-  t = 1;
-  if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &t, sizeof(int)))
-    { perror("setsockopt"); exit(1); }
-
-  a.sin_family = AF_INET;
-  a.sin_port = htons(port);
-  a.sin_addr.s_addr = inet_addr(addr);
-
-  if (bind(s, (struct sockaddr *)&a, sizeof(a))) { perror("bind"); exit(1); }
-  if (listen(s, 5)) { perror("bind"); exit(1); }
-  alen = sizeof(a);
-  t = accept(s, (struct sockaddr *)&a, &alen);
-  if (t == -1) { perror("accept"); exit(1); }
-  close(s);
-
-  printf("connected\n");
-
-  return t;
-}
-
 void usage(void)
 {
   printf(
@@ -66,45 +35,6 @@ void usage(void)
   exit(1);
 }
 
-int fullread(int fd, void *_buf, int count)
-{
-  char *buf = _buf;
-  int ret = 0;
-  int l;
-  while (count) {
-    l = read(fd, buf, count);
-    if (l <= 0) { printf("read socket problem\n"); abort(); }
-    count -= l;
-    buf += l;
-    ret += l;
-  }
-  return ret;
-}
-
-event get_event(int s, char *v, void *d)
-{
-#ifdef T_SEND_TIME
-  struct timespec t;
-#endif
-  int type;
-  int32_t length;
-
-  fullread(s, &length, 4);
-#ifdef T_SEND_TIME
-  fullread(s, &t, sizeof(struct timespec));
-  length -= sizeof(struct timespec);
-#endif
-  fullread(s, &type, sizeof(int));
-  length -= sizeof(int);
-  fullread(s, v, length);
-
-#ifdef T_SEND_TIME
-  return new_event(t, type, length, v, d);
-#else
-  return new_event(type, length, v, d);
-#endif
-}
-
 static void *gui_thread(void *_g)
 {
   gui *g = _g;
@@ -228,6 +158,8 @@ int main(int n, char **v)
 
   database = parse_database(database_filename);
 
+  store_config_file(database_filename);
+
   number_of_events = number_of_ids(database);
   is_on = calloc(number_of_events, sizeof(int));
   if (is_on == NULL) abort();
diff --git a/common/utils/T/tracer/event.c b/common/utils/T/tracer/event.c
index 1d9f3a4081f11840e5428d87ea02b8465e191299..e626b4a7d66594dc46ca46bda6b380ab1e71928d 100644
--- a/common/utils/T/tracer/event.c
+++ b/common/utils/T/tracer/event.c
@@ -1,9 +1,48 @@
 #include "event.h"
 #include "database.h"
+#include "utils.h"
+#include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+event get_event(int socket, char *event_buffer, void *database)
+{
+#ifdef T_SEND_TIME
+  struct timespec t;
+#endif
+  int type;
+  int32_t length;
+
+  /* Events type -1 and -2 are special: the tracee sends its version
+   * of T_messages.txt using those events.
+   * We have to check that the local version of T_messages.txt is identical
+   * to the one the tracee uses. We don't report those events to the
+   * application.
+   */
+
+again:
+  fullread(socket, &length, 4);
+#ifdef T_SEND_TIME
+  fullread(socket, &t, sizeof(struct timespec));
+  length -= sizeof(struct timespec);
+#endif
+  fullread(socket, &type, sizeof(int));
+  length -= sizeof(int);
+  fullread(socket, event_buffer, length);
+
+  if (type == -1) append_received_config_chunk(event_buffer, length);
+  if (type == -2) verify_config();
+
+  if (type == -1 || type == -2) goto again;
+
+#ifdef T_SEND_TIME
+  return new_event(t, type, length, event_buffer, database);
+#else
+  return new_event(type, length, event_buffer, database);
+#endif
+}
+
 #ifdef T_SEND_TIME
 event new_event(struct timespec sending_time, int type,
     int length, char *buffer, void *database)
diff --git a/common/utils/T/tracer/event.h b/common/utils/T/tracer/event.h
index 32abee4ead352ec7b2b36a7b8dace3518c6aeb7e..6272baf1a8f13216959db18951b606690315d46e 100644
--- a/common/utils/T/tracer/event.h
+++ b/common/utils/T/tracer/event.h
@@ -37,6 +37,8 @@ typedef struct {
   int ecount;
 } event;
 
+event get_event(int s, char *v, void *d);
+
 #ifdef T_SEND_TIME
 event new_event(struct timespec sending_time, int type,
     int length, char *buffer, void *database);
diff --git a/common/utils/T/tracer/textlog.c b/common/utils/T/tracer/textlog.c
index ec08596fcaa39c53dbed50913ec17096381d87f8..9b1b4864600d332f491fcd97c2613777d0ead2a2 100644
--- a/common/utils/T/tracer/textlog.c
+++ b/common/utils/T/tracer/textlog.c
@@ -1,8 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
 #include <unistd.h>
 #include "database.h"
 #include "event.h"
@@ -13,39 +11,10 @@
 #include "utils.h"
 #include "../T_defs.h"
 #include "event_selector.h"
+#include "config.h"
 
 #define DEFAULT_REMOTE_PORT 2021
 
-int get_connection(char *addr, int port)
-{
-  struct sockaddr_in a;
-  socklen_t alen;
-  int s, t;
-
-  printf("waiting for connection on %s:%d\n", addr, port);
-
-  s = socket(AF_INET, SOCK_STREAM, 0);
-  if (s == -1) { perror("socket"); exit(1); }
-  t = 1;
-  if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &t, sizeof(int)))
-    { perror("setsockopt"); exit(1); }
-
-  a.sin_family = AF_INET;
-  a.sin_port = htons(port);
-  a.sin_addr.s_addr = inet_addr(addr);
-
-  if (bind(s, (struct sockaddr *)&a, sizeof(a))) { perror("bind"); exit(1); }
-  if (listen(s, 5)) { perror("bind"); exit(1); }
-  alen = sizeof(a);
-  t = accept(s, (struct sockaddr *)&a, &alen);
-  if (t == -1) { perror("accept"); exit(1); }
-  close(s);
-
-  printf("connected\n");
-
-  return t;
-}
-
 void usage(void)
 {
   printf(
@@ -67,45 +36,6 @@ void usage(void)
   exit(1);
 }
 
-int fullread(int fd, void *_buf, int count)
-{
-  char *buf = _buf;
-  int ret = 0;
-  int l;
-  while (count) {
-    l = read(fd, buf, count);
-    if (l <= 0) { printf("read socket problem\n"); abort(); }
-    count -= l;
-    buf += l;
-    ret += l;
-  }
-  return ret;
-}
-
-event get_event(int s, char *v, void *d)
-{
-#ifdef T_SEND_TIME
-  struct timespec t;
-#endif
-  int type;
-  int32_t length;
-
-  fullread(s, &length, 4);
-#ifdef T_SEND_TIME
-  fullread(s, &t, sizeof(struct timespec));
-  length -= sizeof(struct timespec);
-#endif
-  fullread(s, &type, sizeof(int));
-  length -= sizeof(int);
-  fullread(s, v, length);
-
-#ifdef T_SEND_TIME
-  return new_event(t, type, length, v, d);
-#else
-  return new_event(type, length, v, d);
-#endif
-}
-
 static void *gui_thread(void *_g)
 {
   gui *g = _g;
@@ -167,6 +97,8 @@ int main(int n, char **v)
 
   database = parse_database(database_filename);
 
+  store_config_file(database_filename);
+
   number_of_events = number_of_ids(database);
   is_on = calloc(number_of_events, sizeof(int));
   if (is_on == NULL) abort();
diff --git a/common/utils/T/tracer/utils.c b/common/utils/T/tracer/utils.c
index 95b4084822d35e749f8e6d704163ab10e642000f..aac80e9fa588fb6e8990498a1bed462a8f9011d6 100644
--- a/common/utils/T/tracer/utils.c
+++ b/common/utils/T/tracer/utils.c
@@ -5,6 +5,8 @@
 #include <time.h>
 #include <unistd.h>
 #include <ctype.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
 
 void new_thread(void *(*f)(void *), void *data)
 {
@@ -78,6 +80,51 @@ void socket_send(int socket, void *buffer, int size)
   }
 }
 
+int get_connection(char *addr, int port)
+{
+  struct sockaddr_in a;
+  socklen_t alen;
+  int s, t;
+
+  printf("waiting for connection on %s:%d\n", addr, port);
+
+  s = socket(AF_INET, SOCK_STREAM, 0);
+  if (s == -1) { perror("socket"); exit(1); }
+  t = 1;
+  if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &t, sizeof(int)))
+    { perror("setsockopt"); exit(1); }
+
+  a.sin_family = AF_INET;
+  a.sin_port = htons(port);
+  a.sin_addr.s_addr = inet_addr(addr);
+
+  if (bind(s, (struct sockaddr *)&a, sizeof(a))) { perror("bind"); exit(1); }
+  if (listen(s, 5)) { perror("bind"); exit(1); }
+  alen = sizeof(a);
+  t = accept(s, (struct sockaddr *)&a, &alen);
+  if (t == -1) { perror("accept"); exit(1); }
+  close(s);
+
+  printf("connected\n");
+
+  return t;
+}
+
+int fullread(int fd, void *_buf, int count)
+{
+  char *buf = _buf;
+  int ret = 0;
+  int l;
+  while (count) {
+    l = read(fd, buf, count);
+    if (l <= 0) { printf("read socket problem\n"); abort(); }
+    count -= l;
+    buf += l;
+    ret += l;
+  }
+  return ret;
+}
+
 /****************************************************************************/
 /* buffer                                                                   */
 /****************************************************************************/
diff --git a/common/utils/T/tracer/utils.h b/common/utils/T/tracer/utils.h
index f7e3a6d25625bdbdb86570dddb766292bfa51ca8..cdee2e0bc95bf950330c90ad2ebade5fe4c75191 100644
--- a/common/utils/T/tracer/utils.h
+++ b/common/utils/T/tracer/utils.h
@@ -21,6 +21,8 @@ list *list_append(list *l, void *data);
 /****************************************************************************/
 
 void socket_send(int socket, void *buffer, int size);
+int get_connection(char *addr, int port);
+int fullread(int fd, void *_buf, int count);
 
 /****************************************************************************/
 /* buffer                                                                   */
diff --git a/common/utils/T/tracer/vcd.c b/common/utils/T/tracer/vcd.c
index e1fae049bdcfeca046822c1052b2ed81018ba965..4d36db59dfd293403ff707973b7ae684adfaec13 100644
--- a/common/utils/T/tracer/vcd.c
+++ b/common/utils/T/tracer/vcd.c
@@ -1,8 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
 #include <unistd.h>
 #include "database.h"
 #include "event.h"
@@ -13,39 +11,10 @@
 #include "utils.h"
 #include "../T_defs.h"
 #include "event_selector.h"
+#include "config.h"
 
 #define DEFAULT_REMOTE_PORT 2021
 
-int get_connection(char *addr, int port)
-{
-  struct sockaddr_in a;
-  socklen_t alen;
-  int s, t;
-
-  printf("waiting for connection on %s:%d\n", addr, port);
-
-  s = socket(AF_INET, SOCK_STREAM, 0);
-  if (s == -1) { perror("socket"); exit(1); }
-  t = 1;
-  if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &t, sizeof(int)))
-    { perror("setsockopt"); exit(1); }
-
-  a.sin_family = AF_INET;
-  a.sin_port = htons(port);
-  a.sin_addr.s_addr = inet_addr(addr);
-
-  if (bind(s, (struct sockaddr *)&a, sizeof(a))) { perror("bind"); exit(1); }
-  if (listen(s, 5)) { perror("bind"); exit(1); }
-  alen = sizeof(a);
-  t = accept(s, (struct sockaddr *)&a, &alen);
-  if (t == -1) { perror("accept"); exit(1); }
-  close(s);
-
-  printf("connected\n");
-
-  return t;
-}
-
 void usage(void)
 {
   printf(
@@ -65,45 +34,6 @@ void usage(void)
   exit(1);
 }
 
-int fullread(int fd, void *_buf, int count)
-{
-  char *buf = _buf;
-  int ret = 0;
-  int l;
-  while (count) {
-    l = read(fd, buf, count);
-    if (l <= 0) { printf("read socket problem\n"); abort(); }
-    count -= l;
-    buf += l;
-    ret += l;
-  }
-  return ret;
-}
-
-event get_event(int s, char *v, void *d)
-{
-#ifdef T_SEND_TIME
-  struct timespec t;
-#endif
-  int type;
-  int32_t length;
-
-  fullread(s, &length, 4);
-#ifdef T_SEND_TIME
-  fullread(s, &t, sizeof(struct timespec));
-  length -= sizeof(struct timespec);
-#endif
-  fullread(s, &type, sizeof(int));
-  length -= sizeof(int);
-  fullread(s, v, length);
-
-#ifdef T_SEND_TIME
-  return new_event(t, type, length, v, d);
-#else
-  return new_event(type, length, v, d);
-#endif
-}
-
 static void *gui_thread(void *_g)
 {
   gui *g = _g;
@@ -199,6 +129,8 @@ int main(int n, char **v)
 
   database = parse_database(database_filename);
 
+  store_config_file(database_filename);
+
   number_of_events = number_of_ids(database);
   is_on = calloc(number_of_events, sizeof(int));
   if (is_on == NULL) abort();