Cyclic upgrade test

1. After untying, broadcast for 15 minutes;

1.add head；

1. Update SDK version V2.1.0;

1. Optimize multiple false positives caused by hardware jitter; 2. The low-voltage detection function is modified to collect voltage data every 57 minutes for 3 minutes. 16 groups of voltage data are continuously collected at an interval of 100ms every minute, and average voltage data is collected for three times.

1. Rectify the abnormal red indicator.

1. Add 2 seconds to the power-on red light.

1. Set the low voltage reporting threshold to lower than 2.7V.

1. Restore the flooding LED.

1. Fix the problem of unstable detection state from water to no water; 2.APP displays abnormal problems;