WIP: see if availableForWriteAll() is a problem #1579
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pushing log output through a websocket to a connected client is extremely useful, but also quite memory hungry. in order to prevent ourselves from overwhelming out memory, we only allow two concurrent websocket clients. the previous use of cleanupClients() would permit a default number of clients, which is 8 for ESP32. that's too many.
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It is possible that
availableForWriteAll()does return false, leading us to keep a whole bunch of lines of text forever.