https://randhana.com/blog Thoughtful work. Real impact. en-us pulathisi.kariyawasam@gmail.com (Pulathisi Kariyawasam) pulathisi.kariyawasam@gmail.com (Pulathisi Kariyawasam) Fri, 19 Jan 2024 00:00:00 GMT https://randhana.com/blog/lifi-communication https://randhana.com/blog/lifi-communication Implementing a bi-directional text communication system using Li-Fi technology with NodeMCU, demonstrating the potential of light-based data transmission. Fri, 19 Jan 2024 00:00:00 GMT pulathisi.kariyawasam@gmail.com (Pulathisi Kariyawasam) embedded systemsli-fiiotcommunicationwireless https://randhana.com/blog/reverse-engineering-my-dashcams-hidden-rtsp-stream https://randhana.com/blog/reverse-engineering-my-dashcams-hidden-rtsp-stream My Yantop dashcam (sold as the Car DVR/Dash Camera Yantop) only lets you view the live feed through its own app. I used nmap, PCAPdroid and Wireshark to figure out what that app was actually doing on the network, and turned it into a script that opens the same feed straight in VLC - no app, no flashing, no root. Sun, 02 Aug 2026 00:00:00 GMT pulathisi.kariyawasam@gmail.com (Pulathisi Kariyawasam) reverse-engineeringcybersecuritynetworkingiotrtspdashcamyantop