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MQTT client on weak CPU and high traffic environment #127

@cosmo0920

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@cosmo0920

When flood of messages are reached in this client on weak CPU environment,
keep_alive! response may not reached until response timeout and
causes MQTT::ProtocolException with "No Ping Response received for
xxx seconds":

Protocol error occurs in in_mqtt.,MQTT::ProtocolException,No Ping Response received for 23 seconds
/media/Data2/Gitrepo/ruby-mqtt/lib/mqtt/client.rb:541:in `keep_alive!'
/media/Data2/Gitrepo/ruby-mqtt/lib/mqtt/client.rb:474:in `receive_packet'
/media/Data2/Gitrepo/ruby-mqtt/lib/mqtt/client.rb:272:in `block in connect'

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