DTLS patch

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Hello,

We have a server application needs DTLS protocol support. But the current
OTP release still has an incomplete DTLS implementation. So we create this
patch to include DTLS implementation based on current well-designed ssl
architecture (which we don't consider this as a new feature, just a patch).
What we have added are:

1. DTLS transport layer on top of gen_udp
2. DTLS flight retransmission and timeout mechanism
3. DTLS record fragmentation/defragmentation handling

It looks good that the patch can work with OpenSSL 1.0.2a release. If no
one is working on dtls now, we would like to have this patch to be reviewed.

Following is the repository contains the patch:

https://github.com/haiyang-yin/otp

To fetch the patch, refer to following git commands:

git clone https://github.com/haiyang-yin/otp.git
git checkout dtls_patch

Here is code review location:

https://github.com/haiyang-yin/otp/compare/maint...haiyang-yin:dtls_patch

There are two demo programs to show how dtls client/server works in the
attachments.

Feel free to let me know if further information is needed.

Thank you,

/Haiyang

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<div dir=3D"ltr">Hello,<div><br></div><div>We have a server application nee=
ds DTLS protocol support. But the current OTP release still has an incomple=
te DTLS implementation. So we create this patch to include DTLS implementat=
ion based on current well-designed ssl architecture (which we don&#39;t con=
sider this as a new feature, just a patch). What we have added are:</div><d=
iv><br></div><div>1. DTLS transport layer on top of gen_udp</div><div>2. DT=
LS flight retransmission and timeout mechanism</div><div>3. DTLS record fra=
gmentation/defragmentation handling</div><div><br></div><div>It looks good =
that the patch can work with OpenSSL 1.0.2a release. If no one is working o=
n dtls now, we would like to have this patch to be reviewed.</div><div><br>=
</div><div>Following is the repository contains the patch:</div><div><br></=
div><div><a href=3D"https://github.com/haiyang-yin/otp">https://github.com/=
haiyang-yin/otp</a><br></div><div><br></div><div>To fetch the patch, refer =
to following git commands:</div><div><br></div><div>git clone <a href=3D"ht=
tps://github.com/haiyang-yin/otp.git">https://github.com/haiyang-yin/otp.gi=
t</a></div><div>git checkout dtls_patch</div><div><br></div><div>Here is co=
de review location:</div><div><br></div><div><a href=3D"https://github.com/=
haiyang-yin/otp/compare/maint...haiyang-yin:dtls_patch">https://github.com/=
haiyang-yin/otp/compare/maint...haiyang-yin:dtls_patch</a><br></div><div><b=
r></div><div>There are two demo programs to show how dtls client/server wor=
ks in the attachments.</div><div><br></div><div>Feel free to let me know if=
 further information is needed.</div><div><br></div><div>Thank you,</div><d=
iv><br></div><div>/Haiyang</div><div><br></div></div>

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