[serialport] Allow baudrate change at run time (#675)

* Added baudrate change in serialport

* Added baudrate change to "serial request" (not only "serial out")

* Added doc

io/serialport/25-serial.html

@@ -57,6 +57,7 @@
 <script type="text/html" data-help-name="serial out">
     <p>Provides a connection to an outbound serial port.</p>
     <p>Only the <code>msg.payload</code> is sent.</p>
+    <p>Optionally the baudrate can be changed using <code>msg.baudrate</code></p>
     <p>Optionally the new line character used to split the input can be appended to every message sent out to the serial port.</p>
     <p>Binary payloads can be sent by using a Buffer object.</p>
 </script>
@@ -111,6 +112,7 @@
     </li>
     <li><code>msg.count</code> if set this will override the configured number of characters as long as it is less than the number configured.</li>
     <li><code>msg.waitfor</code> single character, escape code, or hex code. If set, the node will wait until it matches that character in the stream and then start the output.</li>
+    <li>Optionally the baudrate can be changed using <code>msg.baudrate</code></li>
     </ul>
     <h3>Outputs</h3>
     <ul>

io/serialport/25-serial.js

@@ -41,6 +41,19 @@ module.exports = function(RED) {
             node.port = serialPool.get(this.serialConfig);
 
             node.on("input",function(msg) {
+				if (msg.hasOwnProperty("baudrate")) {
+					var baud = parseInt(msg.baudrate);
+					if (isNaN(baud)) {
+                        node.error(RED._("serial.errors.badbaudrate"),msg);
+					} else {
+						node.port.update({baudRate: baud},function(err,res) {
+							if (err) {
+								var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
+								node.error(errmsg,msg);
+							}
+						});
+					}
+				}
                 if (!msg.hasOwnProperty("payload")) { return; } // do nothing unless we have a payload
                 var payload = node.port.encodePayload(msg.payload);
                 node.port.write(payload,function(err,res) {
@@ -121,6 +134,19 @@ module.exports = function(RED) {
             node.port = serialPool.get(this.serialConfig);
             // Serial Out
             node.on("input",function(msg) {
+                if (msg.hasOwnProperty("baudrate")) {
+					var baud = parseInt(msg.baudrate);
+					if (isNaN(baud)) {
+						node.error(RED._("serial.errors.badbaudrate"),msg);
+					} else {
+						node.port.update({baudRate: baud},function(err,res) {
+							if (err) {
+								var errmsg = err.toString().replace("Serialport","Serialport "+node.port.serial.path);
+								node.error(errmsg,msg);
+							}
+						});
+					}
+				}
                 if (!msg.hasOwnProperty("payload")) { return; } // do nothing unless we have a payload
                 if (msg.hasOwnProperty("count") && (typeof msg.count === "number") && (node.serialConfig.out === "count")) {
                     node.serialConfig.newline = msg.count;
@@ -249,6 +275,7 @@ module.exports = function(RED) {
                             return payload;
                         },
                         write: function(m,cb) { this.serial.write(m,cb); },
+			update: function(m,cb) { this.serial.update(m,cb); },
                         enqueue: function(msg,sender,cb) {
                             var payload = this.encodePayload(msg.payload);
                             var qobj = {

io/serialport/locales/en-US/25-serial.json

@@ -66,7 +66,8 @@
             "unexpected-close": "serial port __port__ closed unexpectedly",
             "disconnected": "serial port __port__ disconnected",
             "closed": "serial port __port__ closed",
-            "list": "Failed to list ports. Please enter manually."
+            "list": "Failed to list ports. Please enter manually.",
+            "badbaudrate": "Baudrate is not valid"
         }
     }
 }

io/serialport/locales/ja/25-serial.json

@@ -51,7 +51,8 @@
             "unexpected-close": "serial port __port__ closed unexpectedly",
             "disconnected": "serial port __port__ disconnected",
             "closed": "serial port __port__ closed",
-            "list": "ポートのリスト化に失敗しました。手動で入力してください。"
+            "list": "ポートのリスト化に失敗しました。手動で入力してください。",
+            "badbaudrate": "Baudrate is not valid"
         }
     }
 }