Add reconnect time as a configurable parameter.

Closes IDF-1126

include/mqtt_client.h

@@ -166,6 +166,7 @@ typedef struct {
     int refresh_connection_after_ms;        /*!< Refresh connection after this value (in milliseconds) */
     const struct psk_key_hint* psk_hint_key;     /*!< Pointer to PSK struct defined in esp_tls.h to enable PSK authentication (as alternative to certificate verification). If not NULL and server/client certificates are NULL, PSK is enabled */
     bool          use_global_ca_store;      /*!< Use a global ca_store for all the connections in which this bool is set. */
+    int reconnect_timeout_ms;               /*!< Reconnect to the broker after this value in miliseconds if auto reconnect is not disabled */
 } esp_mqtt_client_config_t;
 
 /**

include/mqtt_config.h

@@ -9,7 +9,7 @@
 #include "sdkconfig.h"
 
 #define MQTT_PROTOCOL_311           CONFIG_MQTT_PROTOCOL_311
-#define MQTT_RECONNECT_TIMEOUT_MS   (10*1000)
+#define MQTT_RECON_DEFAULT_MS       (10*1000)
 #define MQTT_POLL_READ_TIMEOUT_MS   (1000)
 
 #if CONFIG_MQTT_BUFFER_SIZE