This is a v1 stub. The full documentation site is coming.
The topic standard
Telemetry uses deterministic topics so identity is never parsed from a string. Reserved $meta and $cmd subtrees are excluded from the telemetry write rule.
topic
# telemetry
tenants/{tid}/devices/{did}/{subsystem}/{field}# reserved (excluded from the write rule)
tenants/{tid}/devices/{did}/$meta/heartbeat
tenants/{tid}/devices/{did}/$cmd/ota