DTLS_timer_cb, DTLS_set_timer_cb - Set callback for controlling DTLS timer
typedef unsigned int (*DTLS_timer_cb)(SSL *s, unsigned int timer_us);
void DTLS_set_timer_cb(SSL *s, DTLS_timer_cb cb);
This function sets an optional callback function for controlling the timeout
interval on the DTLS protocol. The callback function will be called by DTLS
for every new DTLS packet that is sent.
The DTLS_set_timer_cb() function was added in OpenSSL 1.1.1.
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