Editing SimTX API/Connection and handshake (section)

== Accounts on the connection ==
For an authenticated connection, the ServerHello carries the account's id, handle, display name and effective [[SimTX API/Permissions|permissions]], including numeric capabilities such as <code>tx.pa_limit.400</code>. Software should use these for display and to show limits, rather than asking the account service separately.

Authenticated connections carry a '''lease''' of about 12 hours, given as <code>account.lease_expires_at_ms</code>. When it runs out, the server closes the connection. A long-running client should reconnect with a fresh ticket before the lease expires. Changes to the account, such as a revoked device, a new restriction or a ban, can end its connections at any moment.

The ServerHello also carries the server's clocks. <code>simulation_time_ms</code> is the simulated world clock; use it, not the local clock, as "now" for satellite positions and pass predictions.