分享一下我老师大神的人工智能教程！零基础，通俗易懂！http://blog.csdn.net/jiangjunshow
也欢迎大家转载本篇文章。分享知识，造福人民，实现我们中华民族伟大复兴！
关键字：bluetooth 蓝牙协议 HCI剖析 HCI概述 HCI笔记 LMP L2CAP SDP RFCOMM
作者：zhongjun
本着互相学习的目的，来分享此一系列的文章，欢迎转载，请注明作者，尊重版权，谢谢文章有不当处请指正，共同学习
LMP剖析 + 模拟源码：
扫描二维码关注公众号，回复：
4108888 查看本文章
HCI剖析 + 模拟源码：
L2CAP剖析 + 模拟源码
SDP剖析 + 模拟源码（未完成）rfcomm剖析 + 模拟源码（未完成）
另外可以从蓝牙栏目访问我的CSDN：http://blog.csdn.net/XiaoXiaoPengBo/article/category/5998687
------------------------------------------------------------------------------------------------------------------------------------
华丽分割线，进入正题
------------------------------------------------------------------------------------------------------------------------------------
一,部分代码没有完成，只是模拟一个面向连接的从建立到断开的过程，另外，L2CAP的重点状态机和拆包重组没有模拟
bt_l2cap.h
/** This file is part of the L2CAP protocal.* Data :20160510* Author: zhongjun**/#ifndef BT_L2CAP_H_H#define BT_L2CAP_H_H#include "bt_cfg.h"#ifdef DEBUG_BT_L2CAP#define DEBUG(x) {printf x;}#define BT_L2CAP_DEBUG(x) DEBUG(x)#else#define BT_L2CAP_DEBUG(x) #endif/* L2CAP CHANNEL */#define L2CAP_SIG_CH 0x0001#define L2CAP_CONLESS_CH 0x0002/* L2CAP defaults */#define L2CAP_DEFAULT_MTU 672#define L2CAP_DEFAULT_FLUSH_TO 0xFFFF/* UPPER LAYER PSM */#define SDP_PSM 0x0001/* L2CAP command codes */#define L2CAP_COMMAND_REJ 0x01#define L2CAP_CONN_REQ 0x02#define L2CAP_CONN_RSP 0x03#define L2CAP_CONF_REQ 0x04#define L2CAP_CONF_RSP 0x05#define L2CAP_DISCONN_REQ 0x06#define L2CAP_DISCONN_RSP 0x07#define L2CAP_ECHO_REQ 0x08#define L2CAP_ECHO_RSP 0x09#define L2CAP_INFO_REQ 0x0a#define L2CAP_INFO_RSP 0x0b/* connect result */#define L2CAP_CR_SUCCESS 0x0000#define L2CAP_CR_PEND 0x0001#define L2CAP_CR_NOSUP_PSM 0x0002#define L2CAP_CR_SEC_BLOCK 0x0003#define L2CAP_CR_NO_RSR 0x0004/* config result */#define L2CAP_CONF_SUCCESS 0x0000#define L2CAP_CONF_UNACCEPT 0x0001#define L2CAP_CONF_REJECT 0x0002#define L2CAP_CONF_UNKNOWN 0x0003/* config option */#define L2CAP_CONF_MTU 0x01#define L2CAP_CONF_FLUSH_TO 0x02#define L2CAP_CONF_QOS 0x03#define L2CAP_CONF_RFC 0x04#define L2CAP_CONF_RFC_MODE 0x04#pragma pack(1)/* L2CAP structures hdr*/typedef struct { uint16_t len; uint16_t cid;}L2CAP_PDU_HDR_Format;typedef struct { L2CAP_PDU_HDR_Format sig_hdr; uint8_t code; uint8_t ident; uint16_t len;}L2CAP_SIG_HDR_Format;/* L2CAP structures detail*/typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t psm; uint16_t scid;}L2CAP_Con_Req;typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dst_cid; uint16_t src_cid; uint16_t result; uint16_t status;}L2CAP_Con_Rsp;typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dst_cid; uint16_t flags; uint8_t data[0];}L2CAP_Conf_Req;typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t src_cid; uint16_t flags; uint16_t result; uint8_t data[0];}L2CAP_Conf_Rsp;typedef struct { L2CAP_PDU_HDR_Format com_hdr; uint8_t data[0];}L2CAP_Upper_Layer_data_Format;typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dcid; uint16_t scid;}L2CAP_Discon_req;typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dcid; uint16_t scid;}L2CAP_Discon_rsp;#pragma pack()/* API *//* send pdu */int L2CAP_Send_SIG_Con_Req(uint8_t ident,uint16_t psm,uint16_t scid);int L2CAP_Send_SIG_Conf_Req(uint8_t ident,uint16_t dcid,uint16_t flags,uint8_t *conf_opt,uint8_t opt_len);int L2CAP_Send_Upper_Layer_data(uint16_t cid,uint8_t *data,uint16_t length);int L2CAP_Send_SIG_Discon_Req(uint8_t ident,uint16_t dcid,uint16_t scid);int L2CAP_Send_PDU(uint8_t *PDU,uint32_t length);/* reve pdu */int L2CAP_Parse_PDU(uint8_t *PDU,uint32_t length);int L2CAP_Parse_SIG_Con_Rsp_PDU(uint8_t *PDU,uint32_t length);int L2CAP_Parse_SIG_Conf_Rsp_PDU(uint8_t *PDU,uint32_t length);int L2CAP_Parse_SIG_Discon_Rsp_PDU(uint8_t *PDU,uint32_t length);#endifbt_l2cap.c
#include "bt_l2cap.h"int L2CAP_Send_SIG_Con_Req(uint8_t ident,uint16_t psm,uint16_t scid){ L2CAP_Con_Req PDU; PDU.com_hdr.sig_hdr.cid = L2CAP_SIG_CH; PDU.com_hdr.sig_hdr.len = sizeof(L2CAP_Con_Req) - sizeof(L2CAP_PDU_HDR_Format); PDU.com_hdr.code = L2CAP_CONN_REQ; PDU.com_hdr.ident = ident; PDU.com_hdr.len = sizeof(L2CAP_Con_Req) - sizeof(L2CAP_SIG_HDR_Format); PDU.psm = psm; PDU.scid = scid; L2CAP_Send_PDU((uint8_t *)&PDU,sizeof(L2CAP_Con_Req));}int L2CAP_Send_SIG_Conf_Req(uint8_t ident,uint16_t dcid,uint16_t flags,uint8_t *conf_opt,uint8_t opt_len){ L2CAP_Conf_Req *PDU = (L2CAP_Conf_Req *)malloc(sizeof(L2CAP_Conf_Req) + opt_len); (PDU->com_hdr).sig_hdr.cid = L2CAP_SIG_CH; (PDU->com_hdr).sig_hdr.len = sizeof(L2CAP_Conf_Req) - sizeof(L2CAP_PDU_HDR_Format) + opt_len; (PDU->com_hdr).code = L2CAP_CONF_REQ; (PDU->com_hdr).ident = ident; (PDU->com_hdr).len = sizeof(L2CAP_Conf_Req) - sizeof(L2CAP_SIG_HDR_Format) + opt_len; PDU->dst_cid = dcid; PDU->flags = flags; memcpy(PDU->data,conf_opt,opt_len); L2CAP_Send_PDU(PDU,sizeof(L2CAP_Conf_Req) + opt_len);}int L2CAP_Send_Upper_Layer_data(uint16_t cid,uint8_t *data,uint16_t length){ L2CAP_Upper_Layer_data_Format *PDU = (L2CAP_Upper_Layer_data_Format *)malloc(sizeof(L2CAP_Upper_Layer_data_Format) + length); (PDU->com_hdr).cid = cid; (PDU->com_hdr).len = sizeof(L2CAP_Upper_Layer_data_Format) + length; memcpy(PDU->data,data,length); L2CAP_Send_PDU(PDU,sizeof(L2CAP_Upper_Layer_data_Format) + length);}int L2CAP_Send_SIG_Discon_Req(uint8_t ident,uint16_t dcid,uint16_t scid){ L2CAP_Discon_req PDU; PDU.com_hdr.sig_hdr.cid = L2CAP_SIG_CH; PDU.com_hdr.sig_hdr.len = sizeof(L2CAP_Discon_req) - sizeof(L2CAP_PDU_HDR_Format); PDU.com_hdr.code = L2CAP_DISCONN_REQ; PDU.com_hdr.ident = ident; PDU.com_hdr.len = sizeof(L2CAP_Con_Req) - sizeof(L2CAP_SIG_HDR_Format); PDU.dcid = dcid; PDU.scid = scid; L2CAP_Send_PDU((uint8_t *)&PDU,sizeof(L2CAP_Con_Req));}int L2CAP_Send_PDU(uint8_t *PDU,uint32_t length){ int index = 0; BT_L2CAP_DEBUG((" >> Send L2CAP REQ PDU:")); for(index = 0; index < length; index++) { BT_L2CAP_DEBUG(("0x%02x ",PDU[index])); } BT_L2CAP_DEBUG(("\n"));}int L2CAP_Parse_PDU(uint8_t *PDU,uint32_t length){ L2CAP_PDU_HDR_Format *TMP_PDU = (L2CAP_PDU_HDR_Format *)PDU; if((TMP_PDU->cid) == L2CAP_SIG_CH) { uint8_t tmp_code; L2CAP_SIG_HDR_Format *pdu = (L2CAP_SIG_HDR_Format *)PDU; BT_L2CAP_DEBUG(("SIG PDU\n")); tmp_code = pdu->code; switch(tmp_code) { case L2CAP_CONN_RSP: { BT_L2CAP_DEBUG(("L2CAP_CONN_RSP\n")); L2CAP_Parse_SIG_Con_Rsp_PDU(PDU,length); break; } case L2CAP_CONF_RSP: { BT_L2CAP_DEBUG(("L2CAP_CONF_RSP\n")); L2CAP_Parse_SIG_Conf_Rsp_PDU(PDU,length); break; } case L2CAP_DISCONN_RSP: { BT_L2CAP_DEBUG(("L2CAP_DISCONN_RSP\n")); L2CAP_Parse_SIG_Discon_Rsp_PDU(PDU,length); break; } default: { break; } } } else { //TODO }}int L2CAP_Parse_SIG_Con_Rsp_PDU(uint8_t *PDU,uint32_t length){ L2CAP_Con_Rsp *tmp_pdu = (L2CAP_Con_Rsp *)PDU; if(tmp_pdu->result == L2CAP_CR_SUCCESS) { BT_L2CAP_DEBUG(("connect successful\n")); } else if(tmp_pdu->result == L2CAP_CR_PEND) { BT_L2CAP_DEBUG(("connect pending\n")); }}int L2CAP_Parse_SIG_Conf_Rsp_PDU(uint8_t *PDU,uint32_t length){ L2CAP_Conf_Rsp *tmp_pdu = (L2CAP_Conf_Rsp *)PDU; if(tmp_pdu->result == L2CAP_CONF_SUCCESS) { BT_L2CAP_DEBUG(("config successful\n")); } else if(tmp_pdu->result == L2CAP_CONF_UNACCEPT) { BT_L2CAP_DEBUG(("config unaccept\n")); }}int L2CAP_Parse_SIG_Discon_Rsp_PDU(uint8_t *PDU,uint32_t length){ }bt_cfg.h
#ifndef BT_LMP_CFG_H#define BT_LMP_CFG_H#include <stdlib.h>#include <stdio.h>#include <string.h>#define DEBUG_BT_L2CAPtypedef unsigned char uint8_t;typedef unsigned short uint16_t;typedef unsigned int uint32_t;typedef char int8_t;typedef short int16_t;typedef int int32_t;#undef NULL #if defined(__cplusplus)#define NULL 0#else#define NULL ((void *)0)#endif#endifmain.c
#include <stdio.h>#include "bt_l2cap.h"int main(){ uint8_t con_rsp_pdu[] = {0x0C,0x00,0x01,0x00,0x03,0x79,0x08,0x00,0x06,0x08,0x40,0x00,0x00,0x00,0x00,0x00}; uint8_t conf_option[] = {0x01,0x02,0xF4,0x01,0x02,0x02,0xFF,0xFF}; uint8_t conf_rsp_pdu[] = {0x0E,0x00,0x01,0x00,0x05,0x7A,0x0A,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0xF4,0x01}; uint8_t upper_layer_data[] = {0x1,0x1,0x1,0x1,0x1,0x1}; L2CAP_Send_SIG_Con_Req(0x79,SDP_PSM,0x40); L2CAP_Parse_PDU(con_rsp_pdu,sizeof(con_rsp_pdu)); L2CAP_Send_SIG_Conf_Req(0x79,0x0806,0x0,conf_option,sizeof(conf_option)); L2CAP_Parse_PDU(conf_rsp_pdu,sizeof(conf_rsp_pdu)); L2CAP_Send_Upper_Layer_data(0x40,upper_layer_data,sizeof(upper_layer_data)); L2CAP_Send_SIG_Discon_Req(0x79,0x40,0x0806);}给我老师的人工智能教程打call！http://blog.csdn.net/jiangjunshow
