Proper way to call addParameter with string that has quotes

For example. I need to issue a curl command that has the following -d parameter: '{"protocol":"v1","at":"now","device":"defaultDevice@iitgrad","data":{"temp":"25","hum":"11"},"checksum":""}'

Whats the correct way to make the call in my sketch so that this flows through properly?

thanks

Kevin

Try escape double quotes

\"