环保物联网中远程设备实时控制问题研究

Research on Real-time Control of Remote Equipments in Environmental Protection of Internet of Things

选择Flash XMLSocket作为浏览器端和服务器端双向通信的关键技术,解决了HTTP协议中无法直接实现实时双向通信的问题;通过在监听服务器端建立Socket连接通道路由表并实时更新,解决了服务器只能被动连接数采仪导致实时控制时延较大的问题;结果表明,服务器端的控制时延很小,几乎可以忽略不计,浏览器端在足够的网络带宽下,也能保证较低的控制时延,满足了工业使用的需求。

Flash XMLSocket is chosen as the key technology of two--way communication between browser and server, which cannot be directly implemented in HTTP protocol. Because server can he passively connected by data acquisition instrument, high delay may be hap- pened in real--time control, through the establishment of Socket connection channel routing table in the monitor server and updating it in real time, the problem can be avoided. Results show that control delay on the server is very small and it almost can be neglected. When network handwith is enouth, our method also can ensure low control delay on the browser , which can meet the demand for industrial use.