Research And Implementation Of IOT Heterogeneous Resources Access Framework

As a key component of the Internet of Things (IoT), sensor devices play an important role in monitoring the state of external environment. Sensor devices use different protocol to encapsulate and transmit data. Sensor devices are divided into a lot of small collections by their differences. How to solve this problem and realize the unification access of heterogeneous resources becomes an important research direction in IoT technology development. A heterogeneous resources access framework based on the OSGi has been proposed in this thesis. All kinds of sensor devices can access the framework easily. The following research has been done in the thesis.At first, the protocol and connection style used by IoT heterogeneous resources are analyzed and protocol encpusulation standard according to their common characteristics is summarized. In this standard, we encapsulate a protocol and its connection by the defined interfaces. The differences between heterogeneous resources are hidden in the protocol component. That is to say, their external form is the same when the system uses these components.Then, a message parsing module is designed and implemented in this thesis. In this module, a concept of protocol stack is mentioned. This concept is used as a basic unit to manager all the connection and message parsing of heterogeneous resources. It also stores the protocol collection used by an IoT resource. When the message from an IoT resource arrived, it is convenient to fetch the data from message by using protocol stack. After parsing message, the data will be put into the data path. At last, a data path in our framework is designed and implemented. When the heterogeneous resources access framework, the data transmitted by IoT resources won’t arrive IoT application directly. Data will go through access framework and come to IoT application. Access framework can let data flows from IoT resources to IoT application by using data path.A test is given to make sure IoT heterogeneous resources access framework can access all kinds of IoT resources and get the monitoring data correctly.