Based on code from 'Build Web Servers' by Rui Santos. Great eBook, enjoyed reading it - thanks Rui. And thanks to anyone else that spots their code snippet!

Redeveloped project using Web Sockets. For me this method is very fast, reliable and is the cleanest and easiest way to understand and debug IOT devices communicating with Browsers.

Connection details at the top of the main.cpp file. (PMS5003 TX --> ESP RX)

Next steps :- Allow user to save data some how? (email?, webpage?)

Problems overcome:-

PMS5003 needs +5V to power the internal fan, a 3.7v battery doesn't work

ElegantOTA crashes the webserver when you try to read serial port

**PMS5003 TX connection to ESP RX pin** blocks the program uploading through the USB/serial port, disconnect it while programming.

JSON seralize function appends to the string so clear the string if you use it more than once :( only took 4 hours to debug!!!!