diff --git a/Project/applications/smartcities/include/json.h b/Project/applications/smartcities/include/json.h
index 2bc11e6..efcf765 100644
--- a/Project/applications/smartcities/include/json.h
+++ b/Project/applications/smartcities/include/json.h
@@ -3,6 +3,9 @@
 
 #include <string.h>
 #include <stdint.h>
+#include "http.h"
+#include "libwismart.h"
+#include "ch.h"
 
 #define	JSON_POST_OK		0
 #define	JSON_COMM_ERROR		1
@@ -13,7 +16,7 @@
 
 char* prepare_json_statement(char** data, uint32_t nObservations);
 char* prepare_observation(char* observation, uint32_t length);
-uint8_t send_json(char* statement, uint32_t length);
+uint8_t send_json(char* statement, uint32_t length, char* ID);
 uint32_t find_next_index(char* string, uint32_t length, char delimiter);
 char* join_strings(char* str1, char* str2, uint32_t len1, uint32_t len2, bool)
 
diff --git a/Project/applications/smartcities/json.c b/Project/applications/smartcities/json.c
index ab381fe..c70b019 100644
--- a/Project/applications/smartcities/json.c
+++ b/Project/applications/smartcities/json.c
@@ -1,6 +1,6 @@
 #include "json.h"
 
-char* prepare_json_statement(char** data, uint32_t nObservations)
+char* prepare_json_observation_statement(char** data, uint32_t nObservations)
 {
 	unsigned int i, length, observation_length;
 	char *json_statement, *str_aux, *str_aux2;
@@ -10,7 +10,7 @@ char* prepare_json_statement(char** data, uint32_t nObservations)
 	{
 		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); //FREES DATA FROM SENSORS!!!
+		str_aux = join_strings(str_aux,str_aux2,length,observation_length,JOIN_FREE_MEM);
 		length += observation_length;
 	}
 	length--; //REMOVE LAST ','
@@ -40,18 +40,46 @@ char* prepare_observation(char* observation, uint32_t length)
 	return json_data;
 }
 
-uint8_t send_json(char* statement, uint32_t length)
+uint8_t send_json(char* statement, uint32_t length, char* provider_ID, char* sensor_ID)
 {
-	int connectivity;
+	int connectivity, response_code;
+	char* URL;
 	connectivity = libwismart_IsConnected();
 	if(connectivity != WISMART_CONNECT)
 	{
 		return JSON_COMM_ERROR;
 	}
-	//PREPARE HTTP POST
-	//SEND POST
-		//RETURN JSON_OTHER_ERROR
-	//RETURN JSON_POST_OK
+	if(sensor_ID == NULL)
+	{
+		URL = (char*) chHeapAlloc(NULL,17+SERVER_HOSTNAME_LENGTH+strlen(provider_ID));
+		strcpy(URL,"http://");
+		strcpy(URL+7,SERVER_HOSTNAME);
+		strcpy(URL+7+SERVER_HOSTNAME_LENGTH,"/catalog/");
+		strcpy(URL+16+SERVER_HOSTNAME_LENGTH,provider_ID);
+	}
+	else
+	{
+		URL = (char*) chHeapAlloc(NULL,18+SERVER_HOSTNAME_LENGTH+strlen(provider_ID)+strlen(sensor_ID));
+		strcpy(URL,"http://");
+		strcpy(URL+7,SERVER_HOSTNAME);
+		strcpy(URL+7+SERVER_HOSTNAME_LENGTH,"/data/");
+		strcpy(URL+16+SERVER_HOSTNAME_LENGTH,provider_ID);
+		strcpy(URL+16+SERVER_HOSTNAME_LENGTH+strlen(provider_ID),"/");
+		strcpy(URL+17+SERVER_HOSTNAME_LENGTH+strlen(provider_ID),sensor_ID);
+	}
+	response_code = http_post(URL,statement,URL_length,length);
+	if(response code == 200)
+	{
+		return JSON_POST_OK;
+	}
+	else if((response_code >= 400) && (response_code < 500))
+	{
+		return JSON_COMM_ERROR;
+	}
+	else
+	{
+		return JSON_OTHER_ERROR;
+	}
 }
 
 uint32_t find_next_index(char* string, uint32_t length, char delimiter)