GATT_WriteCharValue怎么写多个字节的数据

这个问题解决了，原来是要修改simpleGATTprofile.c中的simpleProfile_WriteAttrCB函数，这里面规定了特征值字节数为1

if ( len != 1 )
{
status = ATT_ERR_INVALID_VALUE_SIZE;
}

但是又出现了新的问题，写5个字节内的数据都没问题，但写6个字节以上的数据就直接Discconected，原因是0x08

#define LL_STATUS_ERROR_CONNECTION_TIMEOUT             0x08 // Connection Timeou

这是为什么？什么地方规定了只能5字节，不是最大为20字节吗？

#define ATT_MTU_SIZE                     L2CAP_MTU_SIZE

#define L2CAP_MTU_SIZE                   23

typedef struct
{
uint16 handle; //!< Handle of the attribute to be written (must be first field)
uint8 len; //!< Length of value
uint8 value[ATT_MTU_SIZE-3]; //!< Value of the attribute to be written
uint8 sig; //!< Authentication Signature status (not included (0), valid (1), invalid (2))
uint8 cmd; //!< Command Flag
} attWriteReq_t;

typedef struct
{
uint8 len; //!< Length of value
uint8 value[ATT_MTU_SIZE-1]; //!< Value of the attribute with the handle given
} attReadRsp_t;

typedef struct
{
uint16 handle; //!< Handle of the attribute to be written (must be first field)
uint16 offset; //!< Offset of the first octet to be written
uint8 len; //!< Length of value
uint8 value[ATT_MTU_SIZE-5]; //!< Part of the value of the attribute to be written
} attPrepareWriteReq_t;

第二个问题，这三个飘红的地方为什么规定的长度不一样？

恳请TI的工程师和高手来帮帮我！！！！谢谢