mqtt_subscribe 缓存已经改成8192， 最大接受数据971个

[zheng618]

topic: topic1_subscribe
message:{
"VIN":"1C22C00001",
"terminalID":0,
"frameID":10,
"sysDataType":1002,
"timestamp":1532345667,
"code":"01",
"data":{
"RCU":"FAFAFAFAFAFAFAFA",
"BCM":"FAFAFAFAFAFAFAFA",
"DC":"FAFAFAFAFAFAFAFA",
"EHB1":"FAFAFAFAFAFAFAFA",
"EHB2":"FAFAFAFAFAFAFAFA",
"EPB1":"FAFAFAFAFAFAFAFA",
"EPB2":"FAFAFAFAFAFAFAFA",
"EPS[2024-01-23 00:51:51.380] [warning] ---------------------------971

#define MQTT_MAX_PACKET_ID (0xFFFF - 1)
#define MQTT_TOPIC_LEN_MAX 64
#define MQTT_ACK_HANDLER_NUM_MAX 64
#define MQTT_DEFAULT_BUF_SIZE 8192
#define MQTT_DEFAULT_CMD_TIMEOUT 5000
#define MQTT_MAX_CMD_TIMEOUT 20000
#define MQTT_MIN_CMD_TIMEOUT 1000
#define MQTT_KEEP_ALIVE_INTERVAL 50 // unit: second
#define MQTT_VERSION 4 // 4 is mqtt 3.1.1
#define MQTT_RECONNECT_DEFAULT_DURATION 1000
#define MQTT_THREAD_STACK_SIZE 2048
#define MQTT_THREAD_PRIO 5
#define MQTT_THREAD_TICK 50