Callback-based BLE GATT server abstraction over the ESP-IDF Bluedroid stack: define services and characteristics with simple read/write handlers, no Bluedroid boilerplate.
OBD-II vehicle data for ESP-IDF: read live PIDs, supported-PID maps, and DTCs from an ELM327 adapter over Bluetooth Classic SPP or BLE, or directly off the CAN bus via the on-chip TWAI controller. Shared decode layer, pluggable links, configurable via menuconfig.