MQTT-TLS is not use all flash storage.
latest version 0.2.12 sample code build with AWS IoT, Verify result(Photon, firmware 0.8.0-rc.2) on the WebIDE is following.
Output of arm-none-eabi-size:
text data bss dec hex
73796 156 11812 85764 14
In a nutshell:
Flash used 73952 / 110592 66.9 %
RAM used 11968 / 20480 58.4 %
Iām finding once I add in OneWire & DS18B20, plus a bit more code it jumps to.
Are there any options we could use to reduce the amount of flash storage used? 
Of course, application size will be fat by using several library.
MQTT-TLS have TLS_RSA_WITH_AES_[128|256]_GCM_SHA[1|256|512] cipher suite, because of this library could connect to the general certificate/TLS server for compatibility.
But if this library could connect to the AWS only, size will be 50-60kbyte. And you could change cipher suite by yourself with config file(included in this library config.h).
I have been testing it out over the past two days and seem to have quite a few stability issues when using it with our existing code - Iām tempted to assume it is resource limitation related as the MQTT TLS code seems to run okay by itself with no other code.
I am using AWS only, I jumped into the config.h file and found most of it was commented out.
Sorry, I wasnāt quite able to follow - what would you recommend to remove that is not required for AWS usage??
Thank you again - this is great what you have created!
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