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TTGO TCall & SIM800C DS V02 ESP32 WIFI Bluetooth Nano Card Slot SIM800C Development Board Hook up Wire (Red) 60 Meters and functionality problems and functionality problems implement proper error handling for bus off conditions and configure the MCP2515's error interrupt to trigger recovery routines when CAN errors exceed threshold limits Portable medical alert systems and personal emergency response devices utilizing cellular voice and SMS capabilities with WIFI for data logging and cloud synchronization Agricultural IoT applications for soil moisture and weather monitoring in remote areas where cellular is the only available connectivity option
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