Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Read, Write and Delete Messages (with I2C Keyboard or Phone). Asking Weather Report. Listening to other Trackers arround. Changing Display Eco Mode (turn off after 4 seconds) and Screen Brightness.

Read, Write and Delete Messages (with I2C Keyboard or Phone). Asking Weather Report. Listening to other Trackers arround. Changing Display Eco Mode (turn off after 4 seg) and Screen Brightness.