diff --git a/Makefile b/Makefile
index 7d032f4..692f123 100644
--- a/Makefile
+++ b/Makefile
@@ -3,16 +3,20 @@ include $(CONF)
 CC="gcc"
 CFLAGS=
 
+MACROS=\
+-DZMQ_TOKEN=\"$(ZMQ_TOKEN)\" \
+-DZMQ_MSG_SIZE=$(ZMQ_MSG_SIZE)
+
 all: publisher subscriber logger
 
 publisher: src/publisher.c src/utils.c
-	$(CC) -lzmq $^ -o $@
+	$(CC) -lzmq $^ -o $@ $(MACROS)
 
 subscriber: src/subscriber.c src/utils.c
-	$(CC) -lzmq $^ -o $@
+	$(CC) -lzmq $^ -o $@ $(MACROS)
 
 logger: src/logger.c src/utils.c
-	$(CC) $^ -o $@
+	$(CC) $^ -o $@ $(MACROS)
 
 publish: publisher logger
 	[ -f pid ] && { kill $(shell cat pid); rm pid; }
diff --git a/config.mk b/config.mk
index 40409b2..020550b 100644
--- a/config.mk
+++ b/config.mk
@@ -1,6 +1,12 @@
 ##### ZeroMQ
 ZMQ_PORT=5556
 SUBSCRIBER_ADDR=localhost
+# ZMQ_TOKEN is used by ZeroMQ to detect
+# messages from publishers. Leave as is if not sure.
+ZMQ_TOKEN="ina260-zmq-publisher"
+# ZMQ_MSG_SIZE max number of bytes per ZeroMQ messages
+# be careful with this parameter
+ZMQ_MSG_SIZE=2550
 
 ##### Logger/Publisher
 # LOGGERS_DIR will contains all the data generated by the loggers
diff --git a/src/publisher.c b/src/publisher.c
index 7c401c4..56fea78 100644
--- a/src/publisher.c
+++ b/src/publisher.c
@@ -17,6 +17,7 @@ void publish(void *publisher, char *filepath, char* client, long int interval);
 
 int main (int argc, char *argv [])
 {
+    printf("%d\n",ZMQ_MSG_SIZE);
     if(argc != 6){
         printf("Usage: %s <abslogdir> <loginterval> <ip> <port> <key>",argv[0]);
         exit(1);
diff --git a/src/utils.h b/src/utils.h
index 4fd6b68..d427d01 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -8,25 +8,24 @@
 #define MIN_INTERVAL 30
 #define INA260_SYSFS "/sys/kernel/ina260"
 #define INA260_POWER_REGISTER "registers/power"
+
 #ifndef ZMQ_TOKEN
 #define ZMQ_TOKEN "ina260-zmq-publisher"
 #endif
+
+#ifndef ZMQ_MSG_SIZE
 #define ZMQ_MSG_SIZE 255*10
+#endif
 
 #define STR(symbol) #symbol
 #define STRINGIFY(symbol) STR(symbol)
-
 #define TIMESTAMP() (time(NULL))
-
 #define INTERVAL(duration)\
     ((TIMESTAMP()) - ((TIMESTAMP())%(duration)))
-
 #define INTERVAL_NEXT(duration)\
     ((INTERVAL(duration))+(duration))
-
 #define INTERVAL_LAST(duration)\
     (INTERVAL(INTERVAL((TIMESTAMP()),(duration))-1,(duration)))
-
 #define FILE_EXISTS(path) (access((path), F_OK) == 0)
 
 void mkdirp(char *path);
\ No newline at end of file