Using Ember plus library for Ember

[mark baldry]

Hi,

We have successfully used the Ember plus library to talk to several devices, now however we need to talk to an Ember (not plus) device, having looked at the previous time this question was asked it all looks reasonably straight forward, but the encoded messages don't seem t make sense, I get the feeling I am missing a document that provides an important bit of information. The previously posted document, "Ember Interface", mentions reading "Ember specification draft" can anyone tell me where to find this please? Does this document detail what the keep-alive is for Ember? If it doesn't is there somewhere else I should be looking?

Thanks in advance.

Mark Baldry

[mark baldry]

After doing something else and coming back to this with a fresh mind I have noticed the Ember+ specification refers to BER (ITU-T X.690 07/2002), this has provided nearly all of the information I was looking for, with the exception of the keep-alive. We are controlling a Studer desk, having obtained its documentation it refers to its own keep-alive, does anyone know if this is this standard for all Ember devices or something implemented only by Studer?

Thanks in advance;

Mark Baldry 

[Philip Boger (LSB)]

Hello Mark,

the legacy Ember protocol did not define an "official" keep-alive mechanism, but you can write an empty frame in regular intervals to test if the tcp connection is still alive. I hope that Studer can help you more on that topic, maybe they have a proven pattern for this.

Ember+ on the other hand has well-defined keep-alive mechanism which you probably have learned about before...

Best regards,

Philip

[mark baldry]

Philip, thanks for the information, Studer do document their keep-alive, and they do as you suggest from both ends. Now that I know there is no generic Kepp-alive I can implement appropriately.

Thanks,

Mark Baldry