#ifndef __COAP_UTIL_H
#define __COAP_UTIL_H
#include <stdint.h>


uint16_t CoAP_Get_Length(void);
void CoAP_Init(uint8_t * coap_message);
// 报文类型，00CON，01NON，10ACK，11Rest
void CoAP_Set_T(uint8_t t);
// 请求类型
void CoAP_Set_Code(uint8_t code);
// messageID
void CoAP_Set_MessageID(uint16_t messageID);
// token  len不能大于8
void CoAP_Set_Token(uint8_t * token, uint8_t len);
// 设置option
void CoAP_Set_Option(uint16_t number, uint16_t length, uint8_t * value);
// 设置字符串类型的option
void CoAP_Set_Option_Str(uint16_t number, char * message);
// 设置short类型的option
void CoAP_Set_Option_Short(uint16_t number, uint16_t num);
// 设置payload
void CoAP_Set_Payload(uint8_t * payload, uint16_t length);
void CoAP_Set_Payload_Str(char * payload);


// 报文解析
// 获取版本号
uint8_t CoAP_Get_Ver(uint8_t * coap_message);
// 获取报文类型
uint8_t CoAP_Get_T(uint8_t * coap_message);
// 获取tkl
uint8_t CoAP_Get_Tkl(uint8_t * coap_message);
// 获取请求方式
uint8_t CoAP_Get_Code(uint8_t * coap_message);
// 获取messageID
uint16_t CoAP_Get_MessageID(uint8_t * coap_message);
// 获取token
uint8_t * CoAP_Get_Token(uint8_t * coap_message, uint8_t * token);
// 获取option长度
uint16_t CoAP_Get_Option_Length(uint8_t * coap_message, uint16_t coap_length, uint16_t number);
// 获取option value
uint8_t * CoAP_Get_Option_Value(uint8_t * coap_message, uint16_t coap_length, uint16_t number, uint8_t * value);
// 获取payload长度
uint16_t CoAP_Get_Payload_Length(uint8_t * coap_message, uint16_t coap_length);
// 获取payload值
uint16_t CoAP_Get_Payload(uint8_t * coap_message, uint16_t coap_length, uint8_t * payload);


#endif