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Is it possible to request a list of available services from ADS in an RDTS (TREP) using web sockets API?
I'm developing an application to post to RCRT over RDTS (TREP) using web sockets API. Although I know that I can ask the TREP administrator for details of what services are available, I'd like to do it via program. if not this, is there other info I can request that is NOT a market data instrument request? In other words, I'd like to request something from ADS or RCRT (Contex) (status? version? other attributes?) to verify the connection, not actual instrument data.
Hi @pj.chan,
You can issue the following request:
{
"Key": {
"Filter": 1
},
"ID": 2,
"Streaming": true,
"Domain": "Source"
}
The "Filter" value is a mask that provides different levels of details:
- 1 (SERVICE_INFO_FILTER) - info that identifies a service
- 2 (SERVICE_STATE_FILTER) - info about the current state of a service
- 4 (SERVICE_GROUP_FILTER) - item group status and item group merge info
- 8 (SERVICE_LOAD_FILTER) - info about the service workload
- 24 (SERVICE_DATA_FILTER) - info that should be applied to all items associated
- 32 (SERVICE_LINK_FILTER) - info about the upstream sources
, which will provide more details in the response,
Hi @pj.chan,
There is no specific documentation around this request and the parameters, however, I did refer to the EMA documentation around sending a directory request and determined that the domain is 'Source' and that I needed to apply a 'Filter'. Section 27.2 of the WebSocket Protocol Spec outlines the parameters of a request.
