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bee5c58b27
* libp2p-ping improvements. * re #950: Removes use of the `OneShotHandler`, but still sending each ping over a new substream, as seems to be intentional since #828. * re #842: Adds an integration test that exercises the ping behaviour through a Swarm, requiring the RTT to be below a threshold. This requires disabling Nagle's algorithm as it can interact badly with delayed ACKs (and has been observed to do so in the context of the new ping example and integration test). * re #864: Control of the inbound and outbound (sub)stream protocol upgrade timeouts has been moved from the `NodeHandlerWrapperBuilder` to the `ProtocolsHandler`. That may also alleviate the need for a custom timeout on an `OutboundSubstreamRequest` as a `ProtocolsHandler` is now free to adjust these timeouts over time. Other changes: * A new ping example. * Documentation improvements. * More documentation improvements. * Add PingPolicy and ensure no event is dropped. * Remove inbound_timeout/outbound_timeout. As per review comment, the inbound timeout is now configured as part of the `listen_protocol` and the outbound timeout as part of the `OutboundSubstreamRequest`. * Simplify and generalise. Generalise `ListenProtocol` to `SubstreamProtocol`, reusing it in the context of `ProtocolsHandlerEvent::OutboundSubstreamRequest`. * Doc comments for SubstreamProtocol. * Adapt to changes in master. * Relax upper bound for ping integration test rtt. For "slow" CI build machines?