socks5: send empty keepalive msg to avoid triggering MIX_TTL during long downloads #3364
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Description
Closes: #3215
During long downloads when the traffic can in some cases be entirely unidirectional, we risk trigger
MIX_TTLwhile the connection is still alive.This PR adds a timer on which empty keepalive messages are sent to keep a regular heartbeat going.
Co-author: @simonwicky, who investigated this issue
NOTE: #3363 was closed due to wrong branch name