docs: function _serverDebug(text, unitID, functionCode, responseBuffer) {
      // If no responseBuffer, then assume this is an error
      // o/w assume an action
      if (typeof responseBuffer === "undefined") {
          modbusSerialDebug({
              error: text,
              unitID: unitID,
              functionCode: functionCode
          });
  
      } else {
          modbusSerialDebug({
              action: text,
              unitID: unitID,
              functionCode: functionCode,
              responseBuffer: responseBuffer.toString("hex")
          });
      }
  }