Productivity is a key factor in the success of a company, and real-time monitoring systems are necessary to achieve this goal. Manual data collection is time-consuming and exhausting. Industrial Internet of Things (IIoT) technology has been rapidly advancing in monitoring and optimizing industrial processes. Production processes can be disrupted due to machine problems, hence the need for analyzing machine efficiency using the Overall Equipment Effectiveness (OEE) method. This study implements a system using Industrial Internet of Things technology based on mobile application to monitor production processes, report production results, assess machine performance using the OEE method, and provide maintenance notifications based on time-based maintenance. The research findings indicate that the implemented production monitoring system on a prototype press machine based on an interactive mobile application interface, is capable of monitoring production processes and reporting production results. The system is also able to assess machine performance using the OEE method, with a calculation accuracy of 99.95% and maintenance notifications with a delay time of 1.04 seconds.