Confirming mLink does not communicate with arduino Uno or Mega. Adding additional port names for arduino (such as ttyS0, ttyS1, ACM, etc.) does not seem to allow communications. Default arduino ports are /dev/ttyUSB0, etc.
Using
/usr/local/makeblock/mLink/mnode --trace-sync-io /usr/local/makeblock/mLink/app.js
shows sync API in use when connection to arduino attempted, but no activity registers in mblock5
All boards work with arduino IDE and mblock v4.0.4