diff --git a/Project/applications/smartcities/buffer.c b/Project/applications/smartcities/buffer.c
index 35b9c73..0b5aee1 100644
--- a/Project/applications/smartcities/buffer.c
+++ b/Project/applications/smartcities/buffer.c
@@ -6,7 +6,7 @@ char** put_message(char* info, char** buf,uint32_t *index, uint32_t *buf_len){
 uint32_t i,len;
 len=*buf_len;
 if(len==*index)
-{
+{  
 
 	char** buffer=join_buf(buf, buf_len);
 	buffer[*index]=chHeapAlloc(NULL,strlen(info)+1);
@@ -56,12 +56,14 @@ int send(char** buf, uint32_t *index, uint32_t *size_buf, char *provider_ID, cha
 	{	return 2;	}
 	printf("abans del JSON\r\n");
 	uint8_t res=send_json(statement, size, provider_ID, sensor_ID);
+	chHeapFree(statement);
 	int i;
 	printf("JSON_POST_OK ?  %d\r\n",res == JSON_POST_OK);
 	if(res==JSON_POST_OK){
-		//for(i=0;i<*index;i++){
-		//	chHeapFree(buf[i]);
-		//}
+		for(i=0;i<*index;i++)
+		{
+			chHeapFree(buf[i]);
+		}
 		printf("djfkhvldkfjhdñkfgv\r\n");
 		if(buf!=NULL)
 			chHeapFree(buf);
diff --git a/Project/applications/smartcities/include/buffer.h b/Project/applications/smartcities/include/buffer.h
index 49a3340..14bca06 100644
--- a/Project/applications/smartcities/include/buffer.h
+++ b/Project/applications/smartcities/include/buffer.h
@@ -4,8 +4,8 @@
 #include "libwismart.h"
 #include "json.h"
 
-#define SOFT_LIMIT      20480  /* en bytes -> 25k * 1024 */
-#define HARD_LIMIT     	25600
+#define SOFT_LIMIT      8192  /* en bytes -> 10k * 1024 */
+#define HARD_LIMIT     	10240
 #define	MEMORY_OK		0
 #define	SOFT_REACHED	1
 #define HARD_REACHED	2
diff --git a/Project/applications/smartcities/json.c b/Project/applications/smartcities/json.c
index 5d7727a..68859b8 100644
--- a/Project/applications/smartcities/json.c
+++ b/Project/applications/smartcities/json.c
@@ -1,4 +1,5 @@
 #include "json.h"
+#include "buffer.h"
 
 uint8_t register_sensor(sensor sens)
 {
@@ -23,15 +24,14 @@ char* prepare_json_observation_statement(char** data, uint32_t nObservations)
 	char *json_statement, *str_aux, *str_aux2;
 	length = 17;
 	str_aux = join_strings("{\"observations\":[","",length,0,JOIN_NO_FREE);
-		printf("nobs=%d\r\n",nObservations);
 	for(i = 0; i < nObservations; i++)
 	{
 		str_aux2 = prepare_observation(data[i],strlen(data[i]));
 		observation_length = strlen(str_aux2);
 		str_aux = join_strings(str_aux,str_aux2,length,observation_length,JOIN_FREE_MEM);
 		length += observation_length;
-		chHeapFree(data[i]);
 		printf("data=%s %d \r\n",data[i],i);
+		check_memory();
 	}
 	length--; //REMOVE LAST ','
 	json_statement = join_strings(str_aux,"]}\0",length,3,JOIN_NO_FREE);
diff --git a/Project/applications/smartcities/main.c b/Project/applications/smartcities/main.c
index 0a7025b..0205b85 100644
--- a/Project/applications/smartcities/main.c
+++ b/Project/applications/smartcities/main.c
@@ -8,6 +8,7 @@
 #include "buffer.h"
 #include "i2c.h"
 #include "configServer.h"
+#include "sensors.h"
 
 #define WIFI_MODE               WIFI_MODE_CLIENT
 #define NETWORK_SSID_AP         "modularsens"
@@ -15,7 +16,6 @@
 #define NETWORK_CHANNEL_AP      1
 
 #define HARD_LIMIT_WAIT_TIME 10*1000 //5*60*1000
-#define NUMSENSORS 4
 
 wismart_registryKey_t geo;
 
@@ -124,7 +124,7 @@ int main(void)
             char* data="message,0";
             char* data2="message,1";
             char* data3="message,2";
-            for(i=0;i<NUMSENSORS;i++){
+            for(i=0;i<TOTAL_SENSORS;i++){
 
                 printf("------------------BUFFER %d ----------------------\r\n",i);
                 printf("index=%d\r\n",ind[i]);
@@ -138,12 +138,13 @@ int main(void)
                 if(res==SOFT_REACHED){
                     printf("--------------soft limit-------------\r\n");
 					int j;
-					for(j=0;j<NUMSENSORS;j++)
+					for(j=0;j<TOTAL_SENSORS;j++)
 					{
 						printf(" enviant buffer %d\r\n",j);
 						
 						// fem servir 085 de prova, però haurem de fer servir sensor_id[j]
 						int ok=send(buffers[j],&ind[j],&sizes[j], "bmp", "085");
+
 						if(ok==JSON_COMM_ERROR)
 						{
 							printf("wismart is not connected\r\n");
@@ -170,7 +171,7 @@ int main(void)
 						chThdSleepMilliseconds(HARD_LIMIT_WAIT_TIME);
 					}
 					int j;
-					for(j=1;j<NUMSENSORS;j++)
+					for(j=1;j<TOTAL_SENSORS;j++)
 					{
 						printf(" enviant buffer %d\r\n",j);