Wireless sensor networks are used for monitoring phenomena using spatially distributed sensor nodes. A wireless sensor network may be far away from a server which collects and processes data from the network. In that case, one or more gateways are used to connect the network to the remote server via TCP/IP or UDP/IP. To speed up testing and deployment of a network, we have developed a simulator which generates packets such as those sent from real sensor nodes and from real gateway. In addition, we have developed a server application and web service for storing and viewing data collected by the network, respectively. In this paper, we describe the wireless sensor network packet simulator, server application and web service, developed at the Institute Mihajlo Pupin.