Substrate connect light client cannot seem to sync blocks

Question

I am trying to integrate the substrate-connect light client extension into our application, connecting to our parachain but getting the following warnings and debug messages in the extension logs.

[18:03:01 609][sync-service-battery_station]GrandPa warp sync still in progress and taking a long time
[18:03:02 428][runtime-battery_station]Worker => NewDownload(block=0x22a8…af0e)
[18:03:02 429][runtime-battery_station]Worker <= FailedDownload(blocks=[0x22a8…af0e], error=StorageQuery(StorageQueryError { errors: [] }))
[18:03:02 449][connections]Problem during discovery on battery_station: NoPeer

In the networks tab of the substrate connect extension the light client says its syncronizing but latest block is showing no value at all.

From the debug messages it seems like its failing to download blocks. Is it because it cannot find a peer?

Anyone seen this behaviour before when trying to connect to a parachain?

Is there some incompatibility in our spec or chain configuration that makes it non compliant with the light client?

Answer 1

FWIW it is not possible to "integrate the substrate-connect light client extension into our application" - I assume that you mean to integrate substrate-connect into your application.

Having said that, from the little logs I see there it seems like the light client you are running is yet not synchronized as there are no Peers running. That probably means that the chain you try to connect to has no bootnodes available in its chainspec, the chain is not running with socket listening and/or the chain has no TLS certificate behind it. I have added links to 2 github issues that refer to the last 2 cases I mentioned.

The latter one (TLS certificate) will not be needed once Light client starts to support the WebRtc protocol.

P.S. FYI in substrate-connect's repo exists a demo project that connects to a parachain, and you can find it here - maybe it can help you with your project.