Hi,
Actually I don't have experience using particle, But I have experience using NRF MCU. Also various kind of project in last 8 years using various kind of MCU(STM32,AVR,NXP,arduino) for hobbyst, Robotic,Industrial, and currently working on defense & aerospace industry.
I'm familiar with I2C on accessing sensor like gyroscope,Accelerometer,magnetometer, EEPROM,FLASH,LM75 temperature Sensor, But not on HTTP over particle. I guess it just need some learning hours since I have known the concept.
Lets discuss the detail over chat.
Best Regards,
Rijal