本文主要是介绍物联网实战--平台篇之(十四)物模型(用户端)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
目录
一、底层数据解析
二、物模型后端
三、物模型前端
四、数据下行
本项目的交流QQ群:701889554
物联网实战--入门篇https://blog.csdn.net/ypp240124016/category_12609773.html
物联网实战--驱动篇https://blog.csdn.net/ypp240124016/category_12631333.html
物联网实战--平台篇https://blog.csdn.net/ypp240124016/category_12653350.html
嵌入式文件 https://download.csdn.net/download/ypp240124016/89409505
APP文件 https://download.csdn.net/download/ypp240124016/89409506
一、底层数据解析
手机端从MQTT服务器收到消息后，首先需要根据协议对数据进行解析，把最终的应用层数据找出并传递到具体的设备模型中去，具体过程如下。
void CenterMan::parseDeciceRecv(QByteArray msg_ba)
{
#define OUT_BUFF_SIZE 1500
#define IN_BUFF_SIZE 1500u8 head[]={0xAA, 0x55}, *pBuff=NULL, *pData=NULL;u8 pack_num=0, cmd_type=0;u32 app_id, curr_dev_sn, next_dev_sn, parent_sn;u16 in_len, out_len, crcValue, data_len=0;u8 out_buff[OUT_BUFF_SIZE]={0}, in_buff[IN_BUFF_SIZE]={0};if( (pBuff=drv_com.memstr((u8*)msg_ba.data(), msg_ba.size(), head, 2)) != NULL ){ServerHeadStruct *pSeverHead=(ServerHeadStruct*)pBuff;crcValue=pSeverHead->crc_h<<8|pSeverHead->crc_l;data_len=pSeverHead->data_len_h<<8|pSeverHead->data_len_l;pData=pBuff+8;//指到app_id地址if(data_len<8 || crcValue != drv_com.crc16(pData, data_len))//CRC校验{qDebug("deviceRecvProcess: crc error!\n");return;}app_id=pData[0]<<24|pData[1]<<16|pData[2]<<8|pData[3];pData+=4;curr_dev_sn=pData[0]<<24|pData[1]<<16|pData[2]<<8|pData[3];parent_sn=0;pData+=4;//指向数据区
// qDebug("deviceRecvProcess: app_id=%u, gw_sn=%08X", app_id, curr_dev_sn);if(app_id==0 || curr_dev_sn==0){qDebug("deviceRecvProcess error: app_id==0 || curr_dev_sn==0");return;}in_len=data_len-8;//加密数据长度if(in_len>IN_BUFF_SIZE)//数据包过长{qDebug("deviceRecvProcess error: in_len>DATA_BUFF_SIZE, in_len=%d", in_len);return;}memcpy(in_buff, pData, in_len);//复制数据u8 deep_counts=1;while(curr_dev_sn>0){u8 encrypt_mode=ENCRYPT_MODE_DISABLE;u8 encrypt_index=0;u8 passwd_buff[20]={0};if(deep_counts==1)//网关设备{encrypt_index=pSeverHead->encrypt_index;//密码索引encrypt_mode=takeDevicePasswd(curr_dev_sn, encrypt_index, passwd_buff);//获取该设备的通讯密码} switch(encrypt_mode){case ENCRYPT_MODE_DISABLE: //不加密{out_len=in_len;if(out_len>OUT_BUFF_SIZE)out_len=0;memcpy(out_buff, in_buff, in_len);break;}case ENCRYPT_MODE_TEA: //TEA加密{out_len=drv_com.TEA_DecryptBuffer(in_buff, in_len, (u32*)passwd_buff);if(out_len>OUT_BUFF_SIZE)out_len=0;memcpy(out_buff, in_buff, out_len);break;}case ENCRYPT_MODE_AES: //AES加密{out_len=drv_com.aes_decrypt_buff(in_buff, in_len, out_buff, OUT_BUFF_SIZE, passwd_buff);break;}default: return;//出错}if(out_len>0){pBuff=pData=out_buff;data_len=pData[0]<<8|pData[1];pData+=2;pack_num=pData[0];pData++;cmd_type=pData[0];pData++;//指向数据区或者下一个数据单元
// qDebug("data_len=%u, pack_num=%u, cmd_type=%u", data_len, pack_num, cmd_type);if(data_len<4 || (data_len>IN_BUFF_SIZE)){qDebug("deviceRecvProcess error: data_len<4 || data_len>IN_BUFF_SIZE, data_len=%d, pack_num=%d", data_len, pack_num);return;}crcValue=pBuff[data_len]<<8|pBuff[data_len+1];if(crcValue != drv_com.crc16(pBuff, data_len))//单元内校验{qDebug("deviceRecvProcess error: crcValue failed!");return;}if(cmd_type==100)//是否为数据包命令{next_dev_sn=pData[0]<<24|pData[1]<<16|pData[2]<<8|pData[3];
// qDebug("next_dev_sn=0x%08X", next_dev_sn);pData+=4;parent_sn=curr_dev_sn;curr_dev_sn=next_dev_sn;in_len=data_len-8;//下一个数据区的长度memset(in_buff, 0, IN_BUFF_SIZE);memcpy(in_buff, pData, in_len);//复制下一个数据单元}else//本机数据,进行处理{
// QByteArray msg_ba((char*)pData, data_len-4);
// qDebug()<<"msg_ba="<<msg_ba.toHex(':');if(app_id==m_currAppWork.appID)//本项目设备{WorkDevStruct *pWorkNode=searchWorkNode(curr_dev_sn);if(pWorkNode){if(parent_sn>0 && pWorkNode->parentSn != parent_sn)//节点父序列号改变{pWorkNode->parentSn=parent_sn;
// requestUpdateWorkName(curr_dev_sn, pWorkNode->devName);//更新父序列号}if(parent_sn==0){pWorkNode->encrypt_index=pSeverHead->encrypt_index;//记录网关的加密模式,方便数据下发}if(pWorkNode->pModel){pWorkNode->pModel->setRawData(app_id, curr_dev_sn, pack_num, cmd_type, pData, data_len-4);}return;}else//设备未存在{if(m_secCounts>10)//可能是还未从服务器请求下来{InitTypeStruct *pInittype=takeInitType(curr_dev_sn);if(pInittype){requestAddDevice(curr_dev_sn, parent_sn);//请求添加设备}}}}curr_dev_sn=0;return;}deep_counts++;if(deep_counts>=5)//嵌套层数{qDebug("deviceRecvProcess error: deep_counts>DEEP_MAX! parent_sn=%u", parent_sn);return;}}else{qDebug("deviceRecvProcess error: out_len<=0!");return;}}}else{qDebug("no found head AA 55");}
}二、物模型后端
数据协议解析完成后，就进入应用数据解析了，就是模型的setRawData函数，这是数据进入物模型的接口，至于模型内的数据和功能，完全是根据产品本身的定义决定的，与嵌入式端对应。
int ModelAp01::setRawData(u32 app_id, u32 dev_sn, u8 pack_num, u8 msg_type, u8 *msg_buff, u16 msg_len)
{if(dev_sn!=m_devSn)return 0;u8 *pData=msg_buff;msg_len=msg_len;if(m_upPackNum==pack_num)return 0;m_upPackNum=pack_num;m_appID=app_id;
// qDebug()<<"msg_type="<<msg_type;switch(msg_type){case AP01_CMD_HEART:{break;}case AP01_CMD_DATA:{int temp=pData[0]<<8|pData[1];//温度 原始数据float temp_f=(temp-1000)/10.f;//温度浮点数据pData+=2;int humi=pData[0]<<8|pData[1];float humi_f=humi/10.f;pData+=2;int pm25=pData[0]<<8|pData[1];pData+=2;u8 speed=pData[0];pData+=1;u8 state=pData[0];pData+=1;qDebug("temp_f=%.1f C, humi_f=%.1f%%, pm25=%d ug/m3, speed=%d, state=%d", temp_f, humi_f, pm25, speed,state);QString dev_sn_str=QString::asprintf("%08X", m_devSn);QString temp_str=QString::asprintf("%.0f", temp_f);QString humi_str=QString::asprintf("%.0f", humi_f);QString pm25_str=QString::asprintf("%03d", pm25);int alarm_level=0;if(pm25<20)alarm_level=0;else if(pm25<30)alarm_level=1;else alarm_level=2;emit siqUpdateSensorValues(dev_sn_str, temp_str, humi_str, pm25_str);emit siqUpdateAlarmLevel(alarm_level);emit siqUpdateSwitchState(state);break;}}QDateTime current_date_time = QDateTime::currentDateTime();m_updateTime=current_date_time.toString("hh:mm:ss");m_onlineTime=m_secTickets;m_onlineState=DEV_STATE_ON_LINE;return 0;
}后端模型文件基本上就是一个类文件，较为简单，开发展也只需集中精力完善这个模型即可。
三、物模型前端
前端模型分为两部分，一个是简易网格模型，一个是具体模型，这个在上一节演示视频的APP界面上显而易见了。至于其它AP01开头的QML文件，就是延续了净化器项目的各个前端模块，比如开关、气泡等等。
详细模型的代码如下：
import QtQuick 2.7
import QtQuick.Controls 1.4
import "../base"BaseModelView
{id:id_baseModelViewparent: theModelAp01.takeModelParent()devName: theModelAp01.takeDeviceName()devSnStr: theModelAp01.takeDevSnStr()ScrollView {id:id_zoneViewimplicitWidth: 400width: parent.widthclip: trueanchors{top:parent.toptopMargin:50bottom:parent.bottom}verticalScrollBarPolicy:Qt.ScrollBarAlwaysOffhorizontalScrollBarPolicy: Qt.ScrollBarAlwaysOffRectangle{id:id_centerRectwidth: parent.widthheight: 800color: "#FAFAFA"Ap01CenterShow//中心圆圈画面{id:id_airCenterShowwidth: parent.widthheight: parent.height*0.6anchors{top:parent.top}}Ap01SwitchItem//开关栏{id:id_switchItemwidth: parent.width*0.96anchors{horizontalCenter:parent.horizontalCentertop:id_airCenterShow.bottom}} Ap01ControlItem //风速控制{id:id_airControlItemanchors{top:id_switchItem.bottomtopMargin:5horizontalCenter:parent.horizontalCenter}}}}Component.onCompleted: {id_zoneView.width=widthid_centerRect.width=width
// console.log("width=", width)}Connections{target: theModelAp01onSiqUpdateSensorValues:{id_airCenterShow.funUpdateThText(temp, humi)//更新温湿度数值id_airCenterShow.funUpdatePm25Text(pm25)//更新PM2.5数值}onSiqUpdateOnlineState:{funSetDevState(state)//更新在线状态}onSiqUpdateDeviceName:{devName=dev_name}}}四、数据下行
像设置开关、调速的指令都是通过信号从模型发送到处理中心的，这个在添加工作设备的时候已经进行信号槽的连接了。
这个槽函数的内容就是对数据进行封装下发
void CenterMan::slotSendDownMsg(u32 app_id, u32 dev_sn, u8 pack_num, u8 msg_type, u8 *msg_buff, u16 msg_len)
{// qDebug()<<"slotSendDownMsg****";u8 data_buff[1500]={0}, make_buff[1500]={0};u16 make_len, data_len;data_len=msg_len;if(msg_len>sizeof(data_buff)){qDebug()<<"slotSendDownMsg error, msg_len>sizeof(data_buff)";return;}memcpy(data_buff, msg_buff, data_len);u32 currDevSn=dev_sn;if(app_id==m_currAppWork.appID)//自身设备{int deep=0;while(currDevSn>0){WorkDevStruct *pWorkNode=searchWorkNode(currDevSn);if(pWorkNode==nullptr){qDebug()<<"pWorkNode==nullptr";return;}if(deep>0){msg_type=200;//转发指令为200}qDebug("down curr_sn=0x%08X, parent_sn=0x%08X", pWorkNode->devSn, pWorkNode->parentSn);if(pWorkNode->parentSn==0)//网关设备{ make_len=makeGwSendBuff(app_id, currDevSn, pack_num, pWorkNode->encrypt_index,msg_type, data_buff, data_len, make_buff, sizeof(make_buff));publishDownMsg(app_id, currDevSn, make_buff, make_len);//发布currDevSn=0;}else//节点设备{make_len=makeNodeSendBuff(currDevSn, pack_num, msg_type, data_buff, data_len, make_buff, sizeof(make_buff));//组合节点数据if(make_len>0 && make_len<sizeof(data_buff)){data_len=make_len;memcpy(data_buff, make_buff, make_len);memset(make_buff, 0, sizeof(make_buff));}else{qDebug("error01, make_len=%u", make_len);return;}currDevSn=pWorkNode->parentSn;//父节点序列号}deep++;}}
}//发送设备下行数据
void CenterMan::publishDownMsg(u32 app_id, u32 gw_sn, u8 *msg_buff, u16 msg_len)
{QString topic=QString(TOPIC_HEAD)+QString::asprintf("dev/sub/data/%u/%08X", app_id, gw_sn);QByteArray msg_ba((char*)msg_buff, msg_len);
// qDebug()<<"000 pub topic="<<topic<<"\nmsg_ba="<<msg_ba.toHex(':');emit sigMqttPushMessage(topic, msg_ba);
}这篇关于物联网实战--平台篇之(十四)物模型(用户端)的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
