Based on your logs, it seems like you haven't enabled debug logs.
CONFIG_BT_RAS_RREQ_LOG_LEVEL_DBG=y
CONFIG_BT_RAS_RRSP_LOG_LEVEL_DBG=y
This may help you debug your code
Briefly looking at your code. The sample there is intended for a single link. Extending it to make it work with multiple ACLs is non-trivial and would take a bit more work than what you have done there, every connection needs to be managed separately, probably with separate semaphores/queues for the local steps.
The controller connected to multiple devices will produce steps for each connection, and the ranging counters are not shared between these. The ranging data from different connections cannot be mixed either.
Not really understand your comments in the code. I don't speak Dutch.
