AsyncStreams disconnect

[wl]

Hello,

I want to keep an asyncstream open to my server (so my server can push a message when new data is available) (as in http://www.b4x.com/forum/basic4android-getting-started-tutorials/7669-asyncstreams-tutorial.html)

I know there is an Error event that will be called in case of a connection failure. But will this event *always* be called when anything is wrong with the connection ? Or should I provide something like a heartbeat mechanism ?

Thank you all !

 

[Erel]

You should also handle the Terminated event.

The Error or Terminated events will always be called when the device "knows" that the connection broke. The connection might appear to be connected although this is not the case.

For that reason I recommend you to use a heartbeat mechanism. You can check B4A-Bridge code for an example.

 

[wl]

thanks Erel !

 

[wl]

Erel,

In order to implement a heartbeat mechanism I would like to have a timeout while reading from the stream. When a timeout occurs a TimeOut event should be called.

It seems this is not possible with the standard RadnomAccess library. Would it be possible to obtain the code so I can make my own version that implements this ?

Thanks !

 

[Erel]

I don't see how RandomAccessFile library is relevant in this case. Are you using AsyncStreams?

 

[wl]

Hi Erel,

Yes I'm using AsyncStreams. But unless I'm mistaken but the AsyncStreams are part of the RandomAccessFile library ?

<name>anywheresoftware.b4a.randomaccessfile.AsyncStreams</name>

Thanks,

Wim

 

[Erel]

I see. You want to update AsyncStreams. I'm sorry but this code is not available. I also don't think that it will help you in anyway.

Implementing a heartbeat mechanism is simple. You should have a timer that counts each second. When a message arrives the timer counter is reset.

If the counter reaches 10 then you break the connection. This is how B4A-Bridge timeout works.