Using retransmission timer

[pokgak]

How is the retransmission of handshake messages done in tinydtls? Based on my testing (by dropping a handshake message manually on the client), there is currently no retransmission done automatically.

Do I need to call dtls_check_retransmit() after a certain period after sending the handshake message?

Also, I found the following in dtls.c. Does this mean that retransmitting handshake messages is still not supported?

tinydtls/dtls.c

Lines 1649 to 1651 in d99fb8c

	/* FIXME: copy to peer's sendqueue (after fragmentation if
	* necessary) and initialize retransmit timer */
	res = CALL(ctx, write, session, sendbuf, len);

[peyton-li]

Do you resolve this problem？
i also find some problem in tinydtls when i use dtls_check_retransmit().

[mrdeep1]

dtls_check_retransmit() needs to be called periodically by a higher layer (unless if you have a CONTIKI environment which starts off a coap_retransmit_process thread) to see if any packet re-transmission is required. next returns the time dtls_check_retransmit() should next be called.

@peyton-li You need to be more specific as to what the problems are.