FO - Failover hub addresses
If a hub goes down, the client's only option is to keep re-trying the last known hub address. This extension will add a list of failover hub addresses, field FO, that the client can try to connect to, if the main hub address fail.[1][2]
Clients should decide the frequency of connection attempts (for the main hub as well as the failover addresses). The client should try connecting in the specified order. The client may decide what to do after the FO-list is exhausted, but recommended is to try to connect to the main hub and continue with the list as before.
The client should display an appropriate message to the user that it has connected to a failover address.
This extension should be implemented, at a minimum, for favourite hubs. If clients have any concerns about where a hub may redirect users to, or about storing the extra state information, then it may avoid implementing this for non-favourite hubs.
Field FO in the hub's INF:
| FO | Failover hub addresses. Specify well formed ADC or ADCS URI addresses, with multiple addresses separated with a comma. Example; FOadc://example.com:1234,adc://example.net:1234 |
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