[#DTLS_timer_cb]
= DTLS_timer_cb
:mrdocs:

Callback that chooses the next DTLS retransmission timeout in microseconds.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef unsigned int(* DTLS_timer_cb)(xref:SSL.adoc[SSL]*, unsigned int);
----

== Return Value

Timeout interval in microseconds until the next DTLS timer expiry.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| DTLS SSL connection about to send a packet.
| *timer_us*
| Previously returned timeout in microseconds, or 0 on the first call.
|===


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