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This paper presents a context-aware system that uses Machine-to-Machine communication to retrieve sensor data collected by an Android operating system smartphone. It uses the eXtensible Messaging and Presence Protocol for communication with a remote server where data are stored, while both ends are implemented in the Open Service Gateway initiative framework providing system modularity and portability. Although our system is designed as a generic system that can be easily applicable for various monitoring purposes or on-event reactions, its functionality has been evaluated by implementing an environment-variables monitoring application used in industrial sectors. The case study presented in this paper elaborates a context-aware application in terms of monitoring and alarming functions. In our case study Android devices are used for communication purposes and monitoring environment …