Other B4X Push Server

Erel · Dec 24, 2014

B4X Push Server is a B4J written back-end server for B4i and B4A apps that use push notifications (Android - GCM, iOS - APN).

Its two main features are:
- Collect device tokens - DeviceToken class.
- Send messages to the devices - Send servlet (which calls iOSPush and AndroidPush modules).

Configuration

There are several settings which you need to configure. The configuration file is located under the Objects folder:

You must set the following properties:
iPushKeyStore / iPushKeystorePassword - Path and password of the push keystore created with B4i (see this tutorial: https://www.b4x.com/android/forum/threads/push-notifications.48562/).

AndroidApiKey - The GCM key from Google developer console (see this tutorial: https://www.b4x.com/android/forum/threads/19226/#content).

PushServerPassword - This value is required when sending messages.

B4A / B4i Apps

The B4A / B4i apps that receive push notifications (client apps) need to register to the push notifications service when they start and send the received token to the B4X push server. You need to configure the push server url in each of the apps.

For the B4A app you need to set the SenderId and to add the required text to the manifest editor.

For the B4i app you need to set the #ProvisionFile attribute to point to the push provision profile.

Server Code

The server code is quite simple and can be customized as needed. It depends on jNetwork library v1.10+ (for the SSLSocket).
The tokens are stored in a SQLite database.

To send a message to all devices (that were updated in the last 3 days) you need to call the Send servlet:
http://<server url>/send?password=<PushServerPassword>&text=Message to send

Apple remote notifications documentation: https://developer.apple.com/library...icationsPG/Chapters/CommunicatingWIthAPS.html
Google GCM documentation: http://developer.android.com/google/gcm/index.html

V0.96 - Fixes an issue with the feedback timer being disabled.
V0.95 - It adds support for iOS feedback service. These lines should be added to existing config files:

#change to: feedback.push.apple.com for production
iFeedback=feedback.sandbox.push.apple.com
iFeedbackPort=2196

The feedback service holds a list of rejected tokens. The server will call it once an hour to find rejected tokens which will then be deleted from the database.

Note that the feedback service isn't working properly in sandbox mode (the problem is in Apple servers).

Erel · Feb 9, 2015

It works fine here. What happens when it tries to reconnect (after 30 seconds)?

Shay · Feb 9, 2015

It is also works fine to me - I am using Amazon EC2 RHEL 7 server
(it is free for 1 year)

Erel · Feb 10, 2015

Interesting Shay. Did it come with Java installed? What did you need to do in order to run the B4X server?

Shay · Feb 10, 2015

I will post the instructions this evening
I also created service from the b4x server and connected it to internal mysql server instead of the local db in the example
b.t.w I wish to create watchdog so once service has issue it will restart it, but I saw the logs are not created to log file only to "screen output".
it is writing only the http string to the log file (not what I put as log() )

Erel · Feb 10, 2015

Shay said:
I wish to create watchdog so once service has issue it will restart it

The connection is restarted automatically.

You don't need a watchdog for the server itself.

Shay · Feb 14, 2015

I am now having same issue:
"Error connecting socket: (EOFException) java.io.EOFException: SSL peer shut down incorrectly"
it is trying to reconnect in loop and never manage to

Shay · Feb 14, 2015

Additional info:
As I see the port is in listening mode and if I send http to is, it seem to response, but it is writing the errors in loop.

restarting httpd service (apache) did not help
after many try I kill and start it again, it started to work again.
but after I updated the file, it started to show errors again

it is not related to my code

JakeBullet70 · Feb 14, 2015

Shay said:
It is also works fine to me - I am using Amazon EC2 RHEL 7 server
(it is free for 1 year)

Thanks for this. I too am using Push and need to move it out into the cloud somewhere. This sounds like a perfect place to start.

Erel · Feb 15, 2015

Restarting apache will not have any effect on this server.

Shay said:
but after I updated the file, it started to show errors again

Which file?

Shay · Feb 15, 2015

b4x project

Erel · Feb 15, 2015

Updating the file will not do anything. You can restart the server.

What you are seeing seems like a network issue.

Shay · Feb 15, 2015

I tried to reboot the server - did not help
I found 1 issue with my code - I don't know if it is related or not:
I found the timeout for retry (which you configured to 30 sec), is written on 2 places, and I changed it to 10 second on 1 place
So I compiled the code again, and now it is ok

Shay · Feb 15, 2015

Erel this is still happening, I cannot understand why
I changed 1 line, compiled it again, and once again it is not working
Can you please investigate this?

Erel · Feb 16, 2015

Try to run the original project as is. Do you see this error?

Can you post the full error message from the logs?

Shay · Feb 16, 2015

I stopped it yesterday from re-trying, and just started it again now
and it started ok (without doing anything - same jar from yesterday)
I think something when we kill it, is not clean, and it causes to fail every time till some OS timeout.
I will send logs next time it happen
this issue is not resolved...

Erel · Feb 16, 2015

A jar is just a set of compiled code. It doesn't change when you run your server.

There can be many possible network issues, especially when you run it on a remove virtual computer.

Shay · Feb 16, 2015

I meant that I did not complied the code again from yesterday
I am connected via ssh to my server, so there is no network issue
but let's see next time it happen - let me know if you wish me to debug something
(if you explain what exactly you do there)

fishwolf · Feb 19, 2015

if i know well:
I have see that in B4A the push is received from a service (in background)
In B4I is received from a event, but work also if the app not running ?

Erel · Feb 19, 2015

Not exactly.

In Android it is based on a static intent filter which then starts the service.
In iOS is based on a special event reserved for push messages.

In both cases it will work even if your app is not running.

fishwolf · Feb 19, 2015

I already have a native app that receive push.

i have use the http interface of push server b4j for register the device with the token (gcm_id) generare from native app
I have configure the AndroidApiKey

i have try to send message but receive this error.

Why?

B4X:

feb 19, 2015 9:19:56 PM org.apache.http.impl.client.DefaultHttpClient handleResponse
Avvertenza: Authentication error: Unable to respond to any of these challenges: {}
<HTML>
<HEAD>
<TITLE>Unauthorized</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<H1>Unauthorized</H1>
<H2>Error 401</H2>
</BODY>
</HTML>
Error sending Android message: Unauthorized

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