Brownout

After a brownout, the I2C temperature sensor at address 0x48 is not responding. Reads return 0xFF (bus floating high). Your firmware must implement retry logic: attempt the read up to 10 times, and store the first valid temperature byte (not 0xFF) to prove the sensor recovered.

The mock sensor returns 0xFF for the first N read attempts, then responds normally with the real temperature value.

This challenge tests a critical embedded skill: handling transient I2C device failures with bounded retry logic.