Client-Server compatibility

VadimMoskvin

Hi.
I work with service that uses Lightstreamer/5.1.1 build 1623.2. Our application include DotNetClient_N2 2.1.
We encountered a bug that was fixed in 3.0.0 version of .NET PCL Client SDK, but changelog says that client

Compatible with Lightstreamer Server since 6.1

Nevertheless, I tried to use it with Lightstreamer/5.1.1 and app worked correct at first glance.

So, my question is: what problems can I face if I use new client (v.3.0.0 or higher) with old server (v5.1.1).

Giuseppe Corti

Hi Vadim,

Indeed, I can confirm that .NET PCL Client 3.0.0 is incompatible specifically with the 6.0.x servers but should work fine with 5.x family servers.
This is because the new client version checker introduced with 6.0 that rejects the new PCL Client SDK.

So to recap, you can still use version PCL client 3.0.0 with your current server version, but you should be aware that you will have problems if the server is upgraded to version 6.0.
But considering that the 5.1.1 version is already very old I think it would make more sense to move directly to 7.0 (or at least 6.1).

Please let us know if you need any further clarifications.

Regards,
Giuseppe

VadimMoskvin

Thanks for your prompt reply.

Indeed, I can confirm that .NET PCL Client 3.0.0 is incompatible specifically with the 6.0.x servers but should work fine with 5.x family servers.

What can you say about the client v3.1.1. Can we use it with 5.x family servers?

Giuseppe Corti

No, since 3.1.0 the PCL client introduced the session recovery mechanism that is supported only by Lightstreamer server 7.0.

VadimMoskvin

Thanks for the clarification.

VadimMoskvin

Another question.
The service is soon moving to the Lightstreamer-Server/7.0.1version. Do I understand correctly that .NET PCL Client 3.0.0 can work with both versions: Lightstreamer/5.1.1and Lightstreamer-Server/7.0.1 ?

Dario Crivelli

Yes. Newer Server versions are always backward compatible with older Client SDK versions.
To resume the case of .NET PCL Client 3.0.0, it was introduced together with Server version 6.1, so:

It works with Server versions 6.1 and above.
Regarding preexisting Server versions, it happens to be compatible with Server versions 5.1.x but not with 6.0.

k707707

Hi guys. Thanks for your great job and cool product. Just another question about compatibility. In our android application we use ls-android-client lib ver. 1.0.2 with LS server ver. 5.1.1. Our server guys are redy to migrate to Lightstreamer-Server ver. 7.0.1. So, may we continue to use our old ls-android-client lib (1.0.2) with new Lightstreamer-Server ver. 7.0.1?
Or we will be get some compatibility issues?
What version of ls-android-client lib do your recomended in this case?

Giuseppe Corti

Hi,

As a rule of thumb newer Lightstreamer servers usually support older clients; this allows our customers to go live in production with the new server version and old clients.
In your specific case I can confirm that your Android client based on lib 1.0.2 should work fine with Lightstreamer 7 without any changes.

In any case, since Android 1.0.2 is quite old and out of support, and in order to take advantage of all the enhancements and bug fixes introduced in newer versions we strongly recommend to upgrade at your earliest convenience to the new Android lib version 4.0 (https://www.lightstreamer.com/api/ls-android-client/4.0.12/).

Regards,
Giuseppe