Internet of Things (IoT) has been undergoing a revolution with the deployment of gateways in low earth orbit (LEO). This revolution offers what IoT has been promising since its inception, namely the connection of an object regardless of its position on Earth. Several physical layers have shown to have the sensitivity for such communications. In this paper, we propose a solution allowing an IoT network operator using LEO satellite to detect different uplink IoT communication technologies based on a same preamble. The proposed approach has been implemented on two ARM cores (Cortex-A72 and Cortex-A9) compliant with the spatial constraints. The experiments carried out demonstrate the real-time capability of the proposed approach even on low-end processor targets with approximately 10% of the CPU time.