lost connection on dynamic IP

[Vicente Bergas <vicencb@gmail.com>]

Hi, i've got the following setup:
A server connected to the Internet through an ISP that provides a
dynamic IP with NAT.
The server keeps the DNS updated with https://github.com/troglobit/inadyn
A client on a tiny embedded board connects to the server by means of
its domain name.
Wireguard configurations are:
# server/etc/wireguard/wg0.conf
[Interface]
ListenPort = port_number
PrivateKey = ...
[Peer]
PublicKey = ...
PresharedKey = ...
PersistentKeepalive = 25
AllowedIPs = 10.0.0.2

# client/etc/wireguard/wg0.conf
[Interface]
PrivateKey = ...
[Peer]
PublicKey = ...
PresharedKey = ...
Endpoint = domain.name.that.resolves.to.a.dynamic.ip:port_number
PersistentKeepalive = 25
AllowedIPs = 10.0.0.1

The server almost never initiates comunications towards the client.
The client sends one packet every minute towards the server.

I think the issue happens when the ISP on the server side shuts down
the Internet connection for more than 1 hour! Then, it is restored
with a new IP.
inadyn detects the new IP and updates the DNS.
At this point the Internet connection is operational again, but the
client remains disconnected until rebooted.

Is this scenario expected to work due to the "Built-in Roaming" ?

Regards,
  Vicenç.