fix:oc mqtt at: add the stdint.h for the header
#define LITEOS_LAB_IOT_LINK_OC_OC_MQTT_OC_MQTT_AL_OC_MQTT_AT_H_
+#include <stdint.h>
+#include <stddef.h>
+
char *hwoc_mqtt_version();
int hwoc_mqtt_connect(int bsmode, unsigned short lifetime, const char *ip, const char *port,
const char *deviceid, const char *devicepasswd);
