向组播地址 239.255.255.250 发送探测请求,然后通过各个IP的应答信息(XML)解析结果
请求数据如下:
"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<Envelope xmlns:dn=\"http://www.onvif.org/ver10/network/wsdl\"xmlns=\"http://www.w3.org/2003/05/soap-envelope\">"
"<Header>"
"<wsa:MessageID xmlns:wsa=\"http://schemas.xmlsoap.org/ws/2004/08/addressing\">uuid:5aab9180-b87e-4238-8f4d-da32ab28e7c4</wsa:MessageID>"
"<wsa:To xmlns:wsa=\"http://schemas.xmlsoap.org/ws/2004/08/addressing\">urn:schemas-xmlsoap-org:ws:2005:04:discovery</wsa:To>"
"<wsa:Action xmlns:wsa=\"http://schemas.xmlsoap.org/ws/2004/08/addressing\">http://schemas.xmlsoap.org/ws/2005/04/discovery/Probe</wsa:Action>"
"</Header>"
"<Body>"
"<Probe xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns=\"http://schemas.xmlsoap.org/ws/2005/04/discovery\">"
"<Types>dn:NetworkVideoTransmitter</Types>"
"<Scopes />"
"</Probe>"
"</Body>"
"</Envelope>"