Added custom message handling

Author: vivian-ng

www/index.html

@@ -112,6 +112,7 @@ <H3>Loading....</H3>
     <script src="js/dropmenu.js"></script>
     <script src="js/localstorage.js"></script>
     <script src="js/UIdisableddlg.js"></script>
+    <script src="js/custom.js"></script>
     <!--endRemoveIf(cleanheader)-->
     <!-- smoosh -->
     <script src="js/app.js"></script>

www/js/app.js

@@ -694,6 +694,9 @@ function process_socket_response(msg) {
         if (msg.startsWith("X:")) {
             process_Position(msg);
         }
+        if (msg.startsWith("esp3d:")) {
+            process_Custom(msg); // handles custom messages sent via M118
+        }
         if (msg.startsWith("ok")) {
             if (socket_is_settings) {
                 //update settings

www/js/custom.js

@@ -0,0 +1,20 @@
+// Functions to handle custom messages sent via serial.
+// In gcode file, M118 can be used to send messages on serial.
+// This allows the microcontroller to communicate with hosts.
+// Example:
+//   M118 esp3d:<your message>
+//      will send "esp3d:<your message>" over serial, which can be picked up by host
+//      to trigger certain actions.
+
+function process_Custom(response) {
+    var freq = 440;  // beep frequency on end of print
+    var dur = 100;  // beep duration on end of print
+    if (response.startsWith("esp3d:eop")) {
+        // Sound to play on end of print
+        // Triggered by message on serial terminal
+        // ESP3D:eop
+        //
+        // This message can be sent via M118.
+        beep(dur, freq);
+    }  
+}