esp_ble_mesh_sensor_data_t::format field
Format A: The Length field is a 1-based uint4 value (valid range 0x0–0xF, representing range of 1 – 16). Format B: The Length field is a 1-based uint7 value (valid range 0x0–0x7F, representing range of 1 – 127). The value 0x7F represents a length of zero.
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uint8_t format : 1,