2019-02-07T01:21:42.052Z INFO Application data folder: /Users/chengg/Library/Application Support/nrfconnect/pc-nrfconnect-linkmonitor
2019-02-07T01:21:42.206Z DEBUG App pc-nrfconnect-linkmonitor v0.7.0 official
2019-02-07T01:21:42.206Z DEBUG App path: /Users/chengg/.nrfconnect-apps/node_modules/pc-nrfconnect-linkmonitor
2019-02-07T01:21:42.206Z DEBUG nRFConnect 2.6.1 is supported by the app (^2.4.0)
2019-02-07T01:21:42.206Z DEBUG nRFConnect path: /Applications/nRF Connect.app/Contents/Resources/app.asar
2019-02-07T01:21:42.206Z DEBUG HomeDir: /Users/chengg
2019-02-07T01:21:42.206Z DEBUG TmpDir: /var/folders/52/bxqyc8551v59txzhrmfxbjxw0000gn/T/
2019-02-07T01:21:42.208Z VERBOSE Could not fetch serial number for serial port at /dev/tty.Bluetooth-Incoming-Port
Note: My macbook has no usb plug, the connection is through the usb-c to usb adapter.