## GDB Server

```sh
./JLinkGDBServerCLExe -select USB=0 -device ATSAMD21E17D -endian little -if SWD -speed 4000 -noir -LocalhostOnly -nologtofile -port 2331 -SWOPort 2332 -TelnetPort 2333
```

## RTT Telnet

```sh
telnet localhost 19021
```