JSON RSSL Conversion Error. RSSL error code : -21 error

Kacper_Piernicki1

Hello,

I would like to ask you for advice on error message that my client received: “JSON RSSL Conversion Error. RSSL error code : -21”.

Client is using below example:

https://github.com/Refinitiv/websocket-api/blob/master/Applications/Examples/CSharp/MarketPriceExample/MarketPriceExample.cs

Basically he is making batch request (approximately 8K RICs) and then error message appear. When he decrease number of RICs He is making batch request (approximately 8K RICs).

Also he notice that when he send smaller number of RIC in his request that usually work but add there View parameter in order to limit number of Fields in response error also appear.

So is there any limit of RICs that you can include in request or maybe it depend on request size?

There is BUFFER_SIZE parameter in example, will this improve situation if client increases this parameter?

I will be grateful for your advice!

Gurpreet

Hello @Kacper_Piernicki1

Since the user is using the Websockets API, the RSSL to JSON Conversion is happening at the RTMDS infrastructure. They can look at the ADS logs to see where the offending value is. The BUFFER_SIZE parameter allocates the send and receive buffers for Websockets, so increasing it might help with the issue.

In general, in this use case, I would recommend the RTSDK instead of Websockets. In WS, the application has to maintain all the state and handshake requirements in addition to handling the response messages. Using RTSDK .NET (EMA) is considerably easier and it handles all the underlying work for the user. The user app is also working with a large batch of instruments and it might overwhelm the network at peak market activity.

The user can start from this EMA batch sample and add View feature. No RSSL to JSON conversion would be required and there will be efficient transfer of the binary data.