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(cherry picked from commit 58a9e0c3)

* Crash when the PushNotification module receive MESSAGE requests
  which have iOS push notification paramters but without token
  for remote push (only VoIP token). Print an error in log instead.
* Change the log level of a false-positive error into 'debug'.
  That was an error that was printed when the PushNotification
  module was receiving requests without push notificaiton
  parameters in their Request-URI. The normal behavior is to
  skip PushNotification module execution.

Implement “Keep-Alive with CRLF” from RFC5626 §4.4.1 and add
tests for it in “Agent” tester suite.

Test improvements:
* Move every generic Test-based class definition into
  tester/utils/test-paterns directory.
* Improve method to wrap Test-based classes into BcUnit test
  function by defining run<ClassT>() template function.
* Print SofiaSip log messages when --verbose option is given
  to ./flexisip_tester.
* Factorize “TlsConnection unit tests” test suite.
* Add new asserts (BC_HARD_ASSERT_TRUE, BC_HARD_ASSERT_FALSE)
  which automatically stop the running test using an exception.
* Update self.signed.cert.test.pem certificate to have a
  valid CN:
    + old: C = FR, ST = Some-State, O = Internet Widgits Pty Ltd, CN = https://localhost:3000/
    + new: C = FR, O = Belledonne Communications, OU = flexisip-tester, CN = localhost

RFC8599PushParams::parsePushParams() and RFC8599PushParams::parseLegacyPushParams()
was returning an empty result when the provider wasn't supported. That
was causing bad behavior in calling code because it was expecting that
there is always at least one element, as the parsing function are to
raise an exception instead of returning an empty map.

Now only one of the same listener can be registered for a specific key.

In order to receive more messages on a new register we raised the sofia
queue size from 256 to 1000 messages. This is the maximum value allowed
by sofia.

When an iOS client has only subscribed to push notifications by only giving
a token for Remote push notifications, call invitation cannot be notified
by using VoIP push notificaton. Then, Flexisip was historically notifying
such clients by sending a single Remote PN, which allowed the client
to display a message to the user and play a ring tone, but only for
a few seconds. Furthermore, should the callee have several devices registered, these
was not notified when the call was accepted or declied by another
device.

This commit improve the strategy of push notification in this situation.
Instead of sending a single PNR, several PNRs are regularily sent in
order the client be able to emulate a continuous ringing by playing
a small ring sound on each PN reception.

Secondly, when the call is accepeted, declined, or canceled by the caller,
a final PN containing the reason of the call end is sent to each device.

Dev + test

In production a crash occured (client side) because a message was restored (stored?)
without body from DB. We try to repoduce the problem with the test
[globalTestBigMessage, tester/fork-context-mysql-tester.cc] without
success even if we used the same message that cause the problem.
To avoid sending message with content-length != 0 and an empty body we
added a security in the MsgSip constructor, it throw a exception if
parsing errors are detected by sofia-sip. This lead to the deletion of
the ForkMessage proxy (may lead to message lost).

Fix + tests (+ reduced global tests duration)

Restore packaging of B2BUA server and internal libmbedtls

---

Fix mbedtls shared lib install (for rpm packaging)

relay static/shared directives to mbedtls

this fixes package dependencies: we embed our own version of mbedtls

---

Fix B2BUA flexisip testsuite

Minor refactoring

SDK: Use video direction of local parameter to create SDP if the participant is in ScheduledForJoining state. Tester: Increase wait time for video to be established and bandwidth computed

Disable event log in the bridging conference. The B2BUA doesn't need it
and it interferes with media streams

---

Remove B2BUA dependency on FFMPEG and V4L

Using Mire for Trenscrypter tests

Also adds debug asserts and increases timeouts in trenscrypter tests

This is to fix B2BUA tests failing on CI because call operations take too long
(in Sanitizer build)
Co-authored-by: Andrea Gianarda <andrea.gianarda@belledonne-communications.com>
Co-authored-by: François Grisez <francois.grisez@belledonne-communications.com>
Co-authored-by: Johan Pascal <johan.pascal@belledonne-communications.com>

Rebuilding the archlinux image brought the latest git 2.35.2 with a fix
for CVE-2022-24765.
However, git now refuses to evaluate any command since the owner of the
build directory isn't the user running the command.

(cherry picked from commit a044f671)

Also remove useless if (LOGD_ENABLED())

(cherry picked from commit 7f5b01b1)

(cherry picked from commit 5cf6d269)

B2BUA brings dependency to a specific version of FFMpeg which
doesn't exists on CentOS 7. That makes the installation of
bc-flexisip package more complex since the installation of
a specific RPM repository is now required.

(cherry picked from commit 6f5e8d83)

with encryption conversion
+ improve test framework

Nix makes it easier to have a reproducible development environment on
any Linux distribution.

It doesn't interfere with other installed tooling, and is just an
additional, optional way to build flexisip.

I have pinned a version of nixpkgs as fallback in case new package versions
would break things, and have verified it builds with a --pure shell and
clean build folder.

The files have been formatted with nixpkgs-fmt (which is included in the
default shell) and should be kept that way for consistency.

Fix issue with domain registration digest authentication failed because the selection of a different SRV node between first and authenticated request.

 - all basic TlsConnection method are now non-blocking (connection,read, write) in every case.
 - TlsConnection::readAll method now handle timeout.
 - Add some tests

Additionally fix some memory issues in the HTTP client
used by the ExternalAuthentication module.

 + linphone-sdk update