I downloaded the latest version earlier this week (iridium_pro_setup_1.3.10.602), and installed it, but iRidium studio was still reporting version 1.3.8.

Running the 1.3.10 installer again, it's telling me that v1.3.10 is already installed?

The KNX driver is working on the server project.

Panel project is synchronised to the server, and the clients send commands to the KNX with

IR.GetDevice("iRidium Server").Set("KNX IP Router." + knx_send, value);

Editor version is 1.3.8.20500.

Only one server is running, so there is only one connection to KNX at a time.

In my testing there's only been 1 or 2 clients connected to the server at a time, but this site could have upwards or 5 clients connected simultaneously.

Yes - all on the same subnet.

Ok, I've set DelayBetweenPolls to 500ms, and SendTime to 200ms. I will leave the server running for a few hours and see if the driver disconnects at any point.

With finding out why it disconnected, before I restarted the server this is the exact behaviour that was repeating;

1. KNX driver disconnects (The KNXnet/IP server device could not find an active data connection with the given ID, Offline)

2. KNX driver is able to connect and start immediately following this

3. Polling of the status feedbacks is started - I see the responses from this for anywhere between 10-40 seconds

4. No statuses are received for the remainder of the time, until 60s since the KNX driver connected.

5. KNX driver disconnects (and repeat the above steps).

The entire time this was happening I was able to ping the KNX device with no lost packets, and didn't lose connection in ETS. 

Hi Vladimir,

So to confirm, after the KNX driver is connected, DelayBetweenPolls is the delay until the poll starts? And this poll would only run once - correct?

The project has about 2800 feedbacks. When the server had been running overnight, the driver was disconnecting every minute (equal to the PingTime). After the server was restarted about half an hour ago, I haven't seen the driver disconnect yet.

What would you recommend as values for the delay and send time? Ideally we want as small delay as possible before sending a command.

I've set the debug level on the KNX Driver to 'Debug', and noticed the following lines in the log before it looked like a poll started. I see this every 60 seconds.

[15-11-2019 09:15:29.455] DEBUG KNX KNXnetIP(4): S/N: 00c501016d7c
[15-11-2019 09:15:29.434] DEBUG KNX KNXnetIP(4): Connect OK
[15-11-2019 09:15:29.299] DEBUG KNX KNXnetIP(4): StartConnect()
[15-11-2019 09:15:29.277] ERROR KNX KNXnetIP(4): The KNXnet/IP server device could not find an active data connection with the given ID, Offline

I don't believe that the KNX connection cannot be made this frequently - what reasons could there be for this seeming connection timeout?

Running a continuous ping on the KNX Router, I don't see Any lost packets.

Edit: The server was rebooted, and I haven't seen the KNX driver disconnect. So it looks like this issue is also related to the server running for an extended amount of time.

Yes, the problem is resolved, thanks! I simply needed to be using the EVENT_RECEIVE_DATA listener instead to allow for 0x00 characters

I see - thanks for your help, Vladimir

This was my first thought, however I only receive data once - the '11, 02, 01, 80' that I would also expect to receive in my example above if this was the case is not seen.

Hi Vladimir,

Thanks for your reply - the AddEndOfString method seems useful, but unfortunately with the protocol

I’m using there isn’t any defined end of string character. The final byte of the message could either represent the end of the ‘data’ section or an error message, so is unknown to me in advance.

I do know that there will always be at least 10 characters received, with the 10th character representing the length of the data in the following bytes (0-128 bytes).