Matter auto-fix IPv6 link-local zone id when network reconnects #21494
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Description:
In case of network reconnection (for example after a Wifi scan), the IPv6 link-local zone id changes, which makes the IPv6 address of the Matter controller invalid (for subscriptions).
This adds an auto-fix of zone-id. For example, if an address was
fe80::221f:3bff:fe93:60b5%st1
but%st1
does not exist anymore, and new Wifi is on%st2
, the address is automatically updated tofe80::221f:3bff:fe93:60b5%st2
.This works also for Ethernet address with
%en<x>
zone ids.On ESP8266, there is no change since Matter is not used.
Checklist:
NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass