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gobex: automatically use SRM when transport type is SOCK_SEQPACKET
This simplifies the applications so SRM setup phase became transparent
while using SOCK_SEQPACKET which is useful for GOEP 2.0 since in that
case we can only use SRM if the transport is L2CAP.
This also follows GOEP 2.0 Page 14 - 4.6 Using Single Response Mode:
"The Server cannot issue an enable request, but can only issue a
response to an enable request from the Client. SRM will remain in
effect for the duration of the operation that enabled it (PUT or GET)
...
SRM headers shall not be sent in CONNECT request or response packets."
and Page 22 - 5.4 Establishment of OBEX Connection:
"SRM headers shall not be sent in the Connect request or response
packets (note, this is to preserve backwards compatibility). SRM shall
be enabled through Put and Get operations only."
So only in case of PUT or GET requests SRM is automatically configured,
applications can still enable it manually for other operations by adding
the headers like before but it is not recommended.
Note that it would be a good practice to indicate SRM support by using
value 0x02, but since that should happens during CONNECT command it is
not done automatically for requests when acting as a client, server
responding to indicate requests will automatically add SRM headers though.