Not really tested

src/custom_modules/VoidGPIO.js

@@ -22,15 +22,17 @@ module.exports = {
         });
     },
     // Calls the GPIO Interface script to set a pin's state regardless of its current state
-    setPin(pin, state, callback) {
+    setPin(pin, state) {
+        return new Promise((resolve, reject) => {
             exec(`python3 src/python/gpio_interface.py set ${pin} ${state}`, (error, stdout, stderr) => {
                 if (error) {
-                callback(error);
+                    reject(error);
                 }
                 if (stderr) {
-                callback(new Error(stderr));
+                    reject(new Error(stderr));
                 }
-            callback(null);
+                resolve();
             })
+        });
     }
 }

src/custom_modules/functions.js

@@ -21,32 +21,28 @@ module.exports = {
         setDefaults() {
             return new Promise((resolve, reject) => {
                 let stateChanges = [];
-                for (const pin of pins) {
+
+                const promises = pins.map(pin => {
                     if (pin.mode === 'OUT') {
-                        gpio.setPin(pin.board, pin.defaultState, (err) => {
+                        return gpio.setPin(pin.board, pin.defaultState).then(() => {
-                            if (err) reject(err);
                             stateChanges.push(`Set ${pin.key} pin to ${pin.defaultState}.`);
-                        })
+                        }).catch(e => console.error(e));
                     }
-                }
+                });
-                resolve(stateChanges.join('\n'));
+
+                Promise.all(promises).then(() => {
+                    const changes = stateChanges.join('\n');
+                    resolve(changes);
+                }).catch(reject);
             });
         },
         // Boot up sanity check during debug mode
-        debugInit() {
+        async debugInit() {
             module.exports.log('Resetting all output pins.');
-            module.exports.gpio.setDefaults().then(changes => {
+            module.exports.gpio.setDefaults().then((changes) => {
                 module.exports.log(changes);
             }).catch(e => console.error(e));
 
-            pins.forEach(pin => {
-                if (pin.mode === 'OUT') {
-                    gpio.setPin(pin.board, pin.defaultState, err => {
-                        if (err) throw err;
-                        module.exports.log();
-                    });
-                };
-            });
             for (const pin of pins) {
                 switch (pin.mode) {
                     case 'OUT':