Fixed broken promise in loadPropeller() and delayed closePort()'s resolve by 250 ms to prevent future openPort() calls from arriving too soon for the OS to accommodate.

Author: PropGit

loader.js

@@ -142,7 +142,7 @@ function loadPropeller(sock, portPath, action, payload, debug) {
             if (port.connId) {
                 // Connection exists, prep to close it first (to reset it), then open it (fresh)
                 originalBaudrate = initialBaudrate;
-                connect = function() {closePort(port).then(function() {return openPort(sock, portPath, initialBaudrate, "programming")}).catch(function(e) {return Promise.reject(e)})}
+                connect = function() {return closePort(port).then(function() {return openPort(sock, portPath, initialBaudrate, "programming")}).catch(function(e) {return Promise.reject(e)})}
 //                The following temporarily removed (and replaced above) to intentionally close and reopen port in hopes it eliminates the CrOS v67+ failed download problem
 //                // Connection exists, prep to reuse it
 //                originalBaudrate = port.baud;

serial.js

@@ -140,7 +140,7 @@ function closePort(port, command) {
                             log("Closed port " + port.path + " (id " + port.connId + ")", mDbug);
                             // Clear connection id to indicate port is closed
                             updatePort(port, {connId: null});
-                            resolve();
+                            setTimeout(resolve, 250);  //Delay resolve() to prevent future openPort() calls from arriving too soon to accommodate
                         } else {
                             log("Could not close port " + port.path + " (id " + port.connId + ")", mDbug);
                             reject(Error(notice(neCanNotClosePort, [port.path])));