Changes the moment we update keepalive_tick.

In order to keep sending keep alive messages in the scenario were client
publish too often with QoS0 the keepalive is updated when the response
is received.

lib/include/mqtt_msg.h

@@ -84,7 +84,7 @@ typedef struct mqtt_connect_info {
     char *password;
     char *will_topic;
     char *will_message;
-    int keepalive;          /*!< keepalive=0 -> keepalive is disabled */
+    int64_t keepalive;          /*!< keepalive=0 -> keepalive is disabled */
     int will_length;
     int will_qos;
     int will_retain;

lib/include/platform_esp32_idf.h

@@ -9,11 +9,12 @@
 #include "freertos/FreeRTOS.h"
 #include "freertos/event_groups.h"
 
+#include <stdint.h>
 #include <sys/time.h>
 
 char *platform_create_id_string(void);
 int platform_random(int max);
-long long platform_tick_get_ms(void);
+int64_t platform_tick_get_ms(void);
 void ms_to_timeval(int timeout_ms, struct timeval *tv);
 
 #define ESP_MEM_CHECK(TAG, a, action) if (!(a)) {                                                      \

lib/platform_esp32_idf.c

@@ -27,7 +27,7 @@ int platform_random(int max)
     return esp_random() % max;
 }
 
-long long platform_tick_get_ms(void)
+int64_t platform_tick_get_ms(void)
 {
     struct timeval te;
     gettimeofday(&te, NULL); // get current time