I2C_COMMAND_ENGINE_HW
struct i2c_command cmd = {i2c_payloads, 1, I2C_COMMAND_ENGINE_HW,
struct i2c_command cmd = {i2c_payloads, 2, I2C_COMMAND_ENGINE_HW,
i2c_command.engine = I2C_COMMAND_ENGINE_HW;//only HW