can cancel promis

main.js

@@ -12,17 +12,48 @@ function delay(delayInms) {
 }
 
 const mongoManager = new MongoManager();
-mongoManager.connect()
 
 let excelUtil = new ExcelUtil();
 let contactList = excelUtil.readContacts();
-(async () => {
+
 // Connect to the device.
-    const [device] = await android.devices();
+
+async function startBook(contactPojo, device) {
     console.log(`Model: ${device.model()}`);
     console.log(`Serial: ${device.serial()}`);
-    let commandor = new CommandorPage(contactList[3], device, mongoManager);
-//read contacts form excel
-    await commandor.loadPage();
-// Take screenshot of the whole device.
-})();
+    let commandor = new CommandorPage(contactPojo, device, mongoManager);
+    //read contacts form excel
+    return await commandor.loadPage();
+}
+
+mongoManager.connect().then(r => console.log("mongo connected"))
+
+async function printFiles() {
+    let devices = await android.devices();
+    await contactList.reduce(async (promise, contactPojo) => {
+        // This line will wait for the last async function to finish.
+        // The first iteration uses an already resolved Promise
+        // so, it will immediately continue.
+        await promise;
+        const contents = await startBook(contactPojo, devices[0]);
+        console.log(contents);
+    }, Promise.resolve());
+}
+
+(async () => {
+    printFiles()
+})()
+
+
+// android.devices().then((device_list) => {
+//     contactList.forEach((contactPojo) => {
+//             device_list.forEach((device) => {
+//                     (async () => {
+//                         await startBook(contactPojo, device)
+//                     })()
+//                 }
+//             )
+//         }
+//     )
+// })
+