Setup Ensure that your site is available globally (e.g. use ngrok) Register with the Airnotifier service ( https://apps.moodle.com/ ) Navigate to Site administration -> Messaging -> Mobile Put the Airnotifier access key in place Ensure that you have a course with the following enrolled: Your admin user A student user Login to the site on the app using a student account Open the "Messaging" app Choose the "Settings" cog icon Ensure that the "Mobile" checkbox is ticked Testing with the App An Android version of the app is already available as an APK which can be manually installed. Testing with Android Log into the app with a Moodle user (student) Android Emulator If you do not have a real Android device, then you can use the Android Emulator from Android Studio. Download the Studio from https://developer.android.com/studio Install the Studio (this takes a while, and requires more heavy downloads) From the "More options" menu, open the "Virtual Device Manager" Create a virtual device for a recent device, against a recent version of Android OS Start your virtual device Drag + Drop the apk into the running device Real device + Emulator Open a connection to your database server Check for the list of entries in the mdl_user_devices table: select * from mdl_user_devices; Open message/output/airnotifier/message_output_airnotifier.php in your editor Find the send_message function Add the following just before the call to $curl->post($serverurl, json_encode($params)); : // !!! MDL-76722: START OF TESTING HACK !!! error_log("Sending a payload to {$serverurl} with content " . json_encode($params)); // !!! MDL-76722: END OF TESTING HACK !!!   // JSON POST raw body request. $resp = $curl->post($serverurl, json_encode($params)); Log in to your Moodle site as the student in the app Check the list of device entries again using the above query Confirm that there is a new entry for this device Confirm that the publickey field is populated In the App, open Messages -> Settings Enable "Mobile" notifications In the Web client, message the student as another user Confirm that a notification appeared on the device Check your web server error logs and find the log entry for "Sending a payload to ..." Confirm that the encrypted field is populated Confirm that the following keys look like garbage (because they're encrypted): Note: Not all fields are always present userfromfullname userfromid sitefullname smallmessage fullmessage fullmessagehtml subject contexturl Test existing notifications with Sodium unavailable Edit lib/classes/encryption.php Find the is_sodium_installed() function Change it to return false; before the extension check. On the site as the admin, send a private message to the student account Confirm the expected notification message arrived on the mobile device as normal Login to the site as an administrator Navigate to Site administration -> Messaging -> Mobile Ensure that the setting `message_airnotifier | encryptnotifications` is on Ensure that the setting `message_airnotifier | encryptprocessing` is set to Do not send notifications at all On the site as the admin, send a private message to the student account Confirm the expected notification message DID NOT arrive on the student device Undo the change to the file Test existing notifications with encryption disabled Login to the site as an administrator Navigate to Site administration -> Messaging -> Mobile Ensure that the setting `message_airnotifier | encryptnotifications` is off On the site as the admin, send a private message to the student account Confirm the expected notification message arrived on the mobile device as normal Test existing large notifications (over 4kb) with encryption disabled Navigate to Site administration -> Messaging -> Mobile Re-enable encryption Using https://www.lipsum.com/ generate a text of 4000 words On the site as the admin, send a private message to the student account copying the previous text Confirm you receive a push notification that just says "Tap to view" Disable encryption On the site as the admin, send a private message to the student account copying the previous text Confirm you receive a push notification that just says "Tap to view" Test notifications with encryption and default settings work Login to the site as an administrator Navigate to Site administration -> Messaging -> Mobile Ensure that the setting `message_airnotifier | encryptnotifications` is on On the site as the admin, send a private message to the student account Confirm the expected notification message arrived on the mobile device as normal Test notifications when encryption is enabled and device not support encryption works as expected Access the Moodle site database, and edit the "user_devices" table to remove the "publickey" field (you have to set it to NULL) for the student device row Login to the site as an administrator Navigate to Site administration -> Messaging -> Mobile Ensure that the setting `message_airnotifier | encryptnotifications` is on Ensure that the setting `message_airnotifier | encryptprocessing` is set to Do not send notifications at all On the site as the admin, send a private message to the student account Confirm the notification did not arrive Login to the site as an administrator Navigate to Site administration -> Messaging -> Mobile Ensure that the setting `message_airnotifier | encryptnotifications` is on Ensure that the setting `message_airnotifier | encryptprocessing` is set to Send notifications without encryption On the site as the admin, send a private message to the student account Confirm the expected notification message arrived on the mobile device as normal Unit tests Open the following files in your editor: ./vendor/bin/phpunit user/tests/devicekey_test.php ./vendor/bin/phpunit user/tests/external/update_user_device_public_key_test.php Find the line just above the class definition in each file: * @requires extension sodium Change it to: * @requires extension salt Initialise phpuit Run the following tests: ./vendor/bin/phpunit user/tests/devicekey_test.php ./vendor/bin/phpunit user/tests/external/update_user_device_public_key_test.php Confirm they are skipped