Wildfires are complex and destructive events with widespread impacts across several domains. Advances in sensor technology have led to more accurate tools for wildfire management. Existing solutions use airborne and ground-based platforms to monitor wildfire spread, environmental parameters, pollutant concentrations and firefighter health. Post-wildfire research focuses on mapping burned areas and detecting hotspots. This paper proposes the design of an integrated framework for developing a multi-sensor node (MSN), featuring an Alarm Module (AM) and a Thermal Mapping Module (TMM). The AM monitors weather parameters, firefighting assets, and firefighter health, while the TMM detects hotspots, identifying potential reignition zones. The MSN connects to nearby smartphones via Bluetooth Low Energy (BLE) and uses them to transmit sensor data to the Internet, simplifying hardware design and reducing costs. Results demonstrate that the smartphone successfully receives sensor data from the MSN via BLE and transmits it to the Internet.