with current technology, big data and analytics are contributing and improving marketing effectiveness by gaining greater insights to plan more relationship-driven strategies.. having said that, the ability of stakeholders in managing/get the most out of the data collected is still a critical success factor (CSF) that contribute to the marketing success or failure with IoT.. maybe you can explore more about the CSF in marketing campaigns/projects with iot
Hi Hussein, We recently did a paper on consumer trust and the IoT which maybe useful- reference is "Harwood, T and Garry, T., (2017), ‘Internet of Things: Understanding trust in techno-service systems’, Journal of Service Management, Vol. 28 Issue: 3, pp.442-475'- Good luck with your PhD