You won't be able to connect directly to CICS with an MQTT client but you can use s WebSphere MQ queue manager or MessageSight appliance as a passthru to act as your MQTT listener which then connects ...
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MQ Light is available both as an on-premise component (using AMQP) or as a Bluemix Service (using either AMQP or JMS). MQ Light enables developers to build scalable, responsive applications ...