Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• Tests for the changes have been added (for bug fixes / features)

• What kind of change does this PR introduce?

feature

• What is the current behavior?

Currently we only get a serial object formatted like this {"D":"output text here\r\n"}

• What is the new behavior?

The output now includes the port generating the output:

{
    "P": "dev/ttyACM0",
    "D":"output text here\r\n"
}

• Does this PR introduce a breaking change?

Probably not

• Other information: