海康ehome协议分析(3)：PTZ云台控制

1. 请求（平台 to 设备）

​​需要发送三次udp报文​​

<?xml version="1.0" encoding="GB2312" ?>
<PPVSPMessage>
    <Version>2.5</Version>
    <Sequence>6256</Sequence>
    <CommandType>REQUEST</CommandType>
    <Method>CONTROL</Method>
    <Command>PTZCONTROL</Command>
    <Params>
        //设备的通道ID
        <Channel>2</Channel>
        //LEFT RIHGT UP DOWN
        <PTZCmd>LEFT</PTZCmd>
        //Start Stop
        <Action>Start</Action>
        //1-7
        <Speed>4</Speed>
    </Params>
</PPVSPMessage>

2. 回复（设备 to 平台）

​​设备就回复平台一次​​

<?xml version="1.0" encoding="GB2312"?>
<PPVSPMessage>
    <Version>2.0</Version>
    <Sequence>6256</Sequence>
    <CommandType>RESPONSE</CommandType>
    <WhichCommand>PTZCONTROL</WhichCommand>
    //成功这里返回 200
    <Status>401</Status>
    <Description>System Oper Faild.</Description>
    <Params/>
</PPVSPMessage>