Hi, I read about your project and I’m very interest to participate in this project. I’m enjoy in the development of C++ projects, for Arduino Uno, ESP8266 and ESP32 programming with Arduino IDE.
I made a project based in the implementation of an Arduino Uno and an ESP8266 where the client can access to a Web Server once is connected to the AP of the ESP8266, where the client can configure the information of a Wi-Fi and a MQTT broker that the ESP will be connected. Also the Arduino reads the data of a temperature sensor (dht22) and send it by UART to the ESP and then the ESP upload the information to an MQTT broker using Mosquitto, into specifics topics, posting the information in JSON format.
Also, I’m making a project where the ESP8266 connects to the Raspberry Pi (acting this as Access Point) where the ESP sends a ID with JSON, the Raspberry verify the ID with a SQL database, and if it is true, the Raspberry will send a JSON data to configure the variables and the pinouts of the ESP, also send the address where the ESP can access to send information read and registered, and then the RPI receive them and send them to a SQL database.
On my profile you can see some pictures of the results of these projects. I hope with this proposal have fulfilled your expectations for this project, I and hope we can talk about this project. Thanks, and Regards!!