Move Firmata into Arduino node so we don't rely on their version of serialport

hardware/Arduino/lib/com.js

@@ -0,0 +1,67 @@
+"use strict";
+
+const Emitter = require("events");
+
+class TransportStub extends Emitter {
+  constructor(path /*, options, openCallback*/) {
+    super();
+    this.isOpen = true;
+    this.baudRate = 0;
+    this.path = path;
+  }
+
+  write(buffer) {
+    // Tests are written to work with arrays not buffers
+    // this shouldn't impact the data, just the container
+    // This also should be changed in future test rewrites
+    /* istanbul ignore else */
+    if (Buffer.isBuffer(buffer)) {
+      buffer = Array.from(buffer);
+    }
+
+    this.lastWrite = buffer;
+    this.emit("write", buffer);
+  }
+
+  static list() {
+    /* istanbul ignore next */
+    return Promise.resolve([]);
+  }
+}
+
+// This trash is necessary for stubbing with sinon.
+TransportStub.SerialPort = TransportStub;
+
+let com;
+let error;
+let SerialPort;
+
+try {
+  /* istanbul ignore else */
+  if (process.env.IS_TEST_MODE) {
+    com = TransportStub;
+  } else {
+    SerialPort = require("serialport").SerialPort;
+    com = SerialPort;
+  }
+} catch (err) {
+  /* istanbul ignore next */
+  error = err;
+}
+
+/* istanbul ignore if */
+if (com == null) {
+  if (process.env.IS_TEST_MODE) {
+    com = TransportStub;
+  } else {
+    console.log("It looks like serialport didn't install properly.");
+    console.log(
+      "More information can be found here https://serialport.io/docs/guide-installation"
+    );
+    console.log(`The result of requiring the package is: ${SerialPort}`);
+    console.log(error);
+    throw "Missing serialport dependency";
+  }
+}
+
+module.exports = com;