I'm not aware of any ROCH implementation in INET, so yes. You may have to do your own implementation. As for the LwIP part. LwIP is an actual (lightweight) implementation of the TCP/IP stack. It's not a compression standard and INET does work with LwIP just fine (by using the LwIP implementation isntead of its own native one). That feature is present in INET for several years now, but it is disabled by default (though you can easily switch on the feature on the project)
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