+### list all connected device
+
+`./sztool list`
+
+The output,
+
+```
+debian@[~/project/remote-ssh]>> ./sztool list
+Mac: 080027a6f8dc
+Connected with result code 0
+Receive topic:080027a6f8dc payload: {'type': 'response', 'from': '2acdeb93b285', 'command': 'list', 'data': 'OK'}
+list
+2acdeb93b285 OK
+timeout
+```
+
+### Connect to the device
+
+1. Run `./sztool connect 2acdeb93b285`