Here are the data structures with brief descriptions:

CMQTTClient_connectOptions
C[struct].returned
C[struct].binarypwd
CMQTTClient_createOptions
CMQTTClient_init_options
CMQTTClient_message
CMQTTClient_nameValue
CMQTTClient_persistence	A structure containing the function pointers to a persistence implementation and the context or state that will be shared across all the persistence functions
CMQTTClient_SSLOptions
CMQTTClient_willOptions
C[struct].payload
CMQTTLenString
CMQTTProperties
CMQTTProperty
C[union].value
C[struct].value.__unnamed0__
CMQTTResponse
CMQTTSubscribe_options