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Fix failing tls upgrade of plain-to-plain botlink. Fixes #580
Found by: maimizuno, Cizzle Patch by: Cizzle Fixes: #580 Upgrading a starting botlink to use TLS when both hub and leaf used non-TLS ports (no +prefix) occasionally timed out for no apparent reason. The failure happened due to the Client Hello of the TLS handshake arriving too soon and together with the "startls -" botlinkmessage at the hub causing that Client Hello to be missed by the TLS handshake. The fix consists of two parts, one for the hub and one for the leaf. This way the fix is backward compatible for hubs having to deal with unpatched leafs and leafs having to deal with unpatched hubs.
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