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Troubleshooting Sygnal deployments

Push notifications can be rather hard to get right, and there are plenty of places to trip up and have nothing but silence to show for your efforts.

This document offers some suggestions of what to check and lists some common pitfalls you may encounter, based on experience.

There are also appendices with information which may be useful for manual debugging.

Your first steps are to ensure that you have logging so you can see what is going on; a level of INFO or even DEBUG will be useful.

Narrowing in on the problem

Check the pusher is registered in your homeserver

Typically, applications will register a pusher on startup.

If you have access to your homeserver, you can check that it is making it there.

Start your application and then run a query against the database.

On Synapse

Use sqlite3 /path/to/homeserver.db or psql synapse as required for your deployment.

SELECT app_id, data FROM pushers
  WHERE user_name = '@my.user:example.org' AND kind='http';

You should see something like:

      app_id       |                        data
-------------------+--------------------------------------------------------
 org.example.chat  | {"format":"event_id_only",
                   |  "url":"https://example.org/_matrix/push/v1/notify"}

On other homeserver implementations

No details available, but contributions welcome.

Check the push gateway (Sygnal) is reachable from the homeserver

Following on from the example above, the homeserver's database contains the push gateway URL of https://example.org/_matrix/push/v1/notify.

It may be worth manually checking that the push gateway is reachable from the homeserver; e.g. with curl:

$ curl https://example.org/_matrix/push/v1/notify
<html>
  <head><title>405 - Method Not Allowed</title></head>
  <body>
    <h1>Method Not Allowed</h1>
    <p>Your browser approached me (at /_matrix/push/v1/notify) with the method "GET".  I only allow the methods HEAD, POST here.</p>
  </body>
</html>

If you get a response, such as an error like 405 Method Not Allowed, as above, this would suggest that the push gateway is at least reachable.

If you get a 404 No Such Resource error on the /_matrix/push/v1/notify endpoint, then chances are that your reverse proxy is not configured to pass through the full URL.

If you don't get an HTTP response, then it is probably worth investigation. Check that:

  • Sygnal is running
  • Sygnal's configuration makes it listen on the desired port
  • Any reverse proxies are correctly set up and running
  • The firewall permits inbound traffic on the port in question

Troubleshooting Firebase notifications

iOS-specific troubles with apps using Firebase

App doesn't receive notifications when inactive

Sygnal currently only sends 'data messages' (also called 'silent notifications', but this name could be misleading).

Whereas data messages will wake up apps on Android with no additional changes, iOS needs to be told that a notification is meant to wake up an inactive app. This is done with FCM's content_available flag, which you can set in your fcm_options dictionary for the Firebase pushkin. (See sygnal.yaml.sample.)

Troubleshooting APNs notifications

Base64 decoding error in the logs

Common cause 1: Hex rather than base64 encoding

Sygnal's APNs support expects your pushkeys to be base64 encoded rather than hexadecimally encoded.

(Why? The previous APNs API which Sygnal supported was binary and didn't define a text-safe encoding, so it was chosen to use base64 in Sygnal. Now the new API exists and specifies hexadecimal encoding, but Sygnal retains backwards compatibility and will do the base64-to-hex conversion.)

Common cause 2: Firebase token given

If you are using Firebase for your iOS app, you will get Firebase tokens (looking a bit like blahblahblah:APA91blahblahblah… note the presence of a colon which is not valid base64).

In this case, you need to configure Sygnal to use a FCM (gcm) pushkin rather than an APNs one, as Firebase talks to APNs on your behalf. Instead of configuring Sygnal with your APNs secrets, you need to configure Firebase with your APNs secrets, and Sygnal with your Firebase secrets.

App doesn't receive notifications when inactive

If you want your application to be woken up to be able to process APNs messages received when your application is in the background, you need to set the content-available flag in your pusher's default payload — see the notes for iOS applications.

'400 BadDeviceToken' error

If you get a bad device token error and you have doubled-checked the token is correct, it is possible that you have used a token from the wrong 'environment', such as a development token when Sygnal is configured to use the production environment.

Sygnal connects to the production APNs instance by default. This will return 400 BadDeviceToken if you send it a token intended for the sandbox APNs server.

Either use production tokens, or switch to the sandbox APNs server by setting:

com.example.myapp.ios:
  type: apns
  ...
  platform: sandbox

in your Sygnal config file.

'ValueError: Could not deserialize key data'

This error suggests that your key file (.p8 file) is not valid. If viewed with a text editor, the file should begin with ----- BEGIN PRIVATE KEY -----. If yours doesn't, you probably have the wrong kind of file.

Appendices

Sending a notification to Sygnal manually with curl

Note: this depends on the heredoc syntax of the bash shell.

curl -i -H "Content-Type: application/json" --request POST -d '@-' http://syg1:8008/_matrix/push/v1/notify <<EOF
{
  "notification": {
    "event_id": "\$3957tyerfgewrf384",
    "room_id": "!slw48wfj34rtnrf:example.org",
    "type": "m.room.message",
    "sender": "@exampleuser:example.org",
    "sender_display_name": "Major Tom",
    "room_name": "Mission Control",
    "room_alias": "#exampleroom:example.org",
    "prio": "high",
    "content": {
      "msgtype": "m.text",
      "body": "I'm floating in a most peculiar way."
    },
    "counts": {
      "unread": 2,
      "missed_calls": 1
    },
    "devices": [
      {
        "app_id": "<APP ID HERE>",
        "pushkey": "<PUSHKEY HERE>",
        "pushkey_ts": 12345678,
        "data": {},
        "tweaks": {
          "sound": "bing"
        }
      }
    ]
  }
}
EOF

Example of an FCM request

HTTP data sent to https://fcm.googleapis.com/fcm/send:

POST /fcm/send HTTP/1.1
User-Agent: sygnal
Content-Type: application/json
Authorization: key=<FCM TOKEN HERE>
Host: fcm.googleapis.com

{"data": {"event_id": "$3957tyerfgewrf384", "type": "m.room.message", "sender": "@exampleuser:example.org", "room_name": "Mission Control", "room_alias": "#exampleroom:example.org", "membership": null, "sender_display_name": "Major Tom", "content": {"msgtype": "m.text", "body": "I'm floating in a most peculiar way."}, "room_id": "!slw48wfj34rtnrf:example.org", "prio": "high", "unread": 2, "missed_calls": 1}, "priority": "high", "to": "<PUSHKEY HERE>"}

You can send using curl using:

curl -i -H "Content-Type: application/json" -H "Authorization: key=<FCM TOKEN HERE>" --request POST -d '@-' https://fcm.googleapis.com/fcm/send <<EOF
{"data": {"event_id": "$3957tyerfgewrf384", "type": "m.room.message", "sender": "@exampleuser:example.org", "room_name": "Mission Control", "room_alias": "#exampleroom:example.org", "membership": null, "sender_display_name": "Major Tom", "content": {"msgtype": "m.text", "body": "I'm floating in a most peculiar way."}, "room_id": "!slw48wfj34rtnrf:example.org", "prio": "high", "unread": 2, "missed_calls": 1}, "priority": "high", "to": "<PUSHKEY HERE>"}
EOF