Hard Stuff libs: Http wrapper

This PlatformIO lib is designed to abstract complexity away from using the ArduinoHttpClient library, specifically for GET and POST requests. This means:

• provide useful structs for bundling request and response details, HardStuffHttpRequest and HardStuffHttpResponse
• calling high-level functions rather than low-level functions (e.g. getFromHTTPServer with bundled request details and returning bundled response details, instead of beginRequest then get then manually loading each header then manually compiling the params in the url then...)
• automatically follows redirects (up to 2). (This assumes your CA Certs can follow the redirects.)

Usage

This is specifically designed for GET and POST requests. Use more-or-less as normal, but leverage the advantages of the bundled HardStuffHttpRequest and HardStuffHttpRespones structs.

Basic Example

#include <configs/wiremock.h> // Define your wiremock details in a config, i.e. WIREMOCK_SERVER & WIREMOCK_PORT

#include <WiFiClientSecure.h>
WiFiClientSecure wifi_client;

#include <HardStuff-Http.hpp>
HardStuffHttpClient http_wiremock(wifi_client, WIREMOCK_SERVER, WIREMOCK_PORT); // Create an HTTP wrapper around the client

void setup() {
    SIM7600::init();
    wifi_client.setCACert(WIREMOCK_CERT_CA); // Set the SSL certificate for secure communication between client and server.
}

void loop() {
    HardStuffHttpRequest request;
    request.addParam("device_mac", getMacAddress()); // Include the device's mac address as a http parameter

    HardStuffHttpResponse response = http_wiremock.getFromHTTPServer("/hello_world", request); // Perform a get request on the /hello_world endpoint
    response.print(); // print the HTTP response
    // continue as normal
}

Struct functions available

HardStuffHttpRequest

• addHeader(key, value) allows you to add a header to the request (maximum of 10).
• addParam(key, value) allows you to add a parameter to the request (maximum of 10).
• clear(ignore_headers) allows you to clear the request (but selectably remove the headers).
• print(ignore_headers) prints the HardStuffHttpRequest to Serial (useful for debugging)
• the variable content is your content String. You can, for example, stringify a JSON into this variable.

HardStuffHttpResponse

• success() quickly bool returns if the request was a success (result code is between 200 and 300).
• print() prints the HardStuffHttpResponse to Serial
• clear() wipes all variables in the HardStuffHttpResponse (you might use this instead of descoping/deleting if you're stack conscious).
• the variable body is the response body String. You can, for example, JSONify this into a variable.
• the variable headers are the headers returned.

Functions available

• postToHTTPServer(String endpoint, HardStuffHttpRequest *request) is for performing a POST request to a given endpoint. Use the HardStuffHttpRequest to define the headers, params, and content to post.
• getFromHTTPServer(String endpoint, HardStuffHttpRequest *request, bool skip_body) is for performing a GET request to a given endpoint. You can include request params/headers (optional), and you can choose to skip_body if, for example, you're streaming the content into a file or memory during OTA updates.
• formatTimeISO8601(time_t t) is for converting an epoch timestamp into an ISO8601 string (YYYY-MM-DDThh:mm:ssZ).
• formatTimeFromISO8601(String timestamp) is for converting an ISO8601 string (YYYY-MM-DDThh:mm:ssZ) into an epoch timestamp.

Dependencies

• arduino-libraries/ArduinoHttpClient
• paulstoffregen/Time

Compabibility and testing

This library has been tested on the ESP32S3 with both the internal WiFi functionality and a SIMCOM SIM7600G for various purposes include OTA updates, and GET/POST requests to Airtable, AWS, and Wiremock.

Hard Stuff

Hard Stuff is a hardware prototyping agency and venture studio focussing on sustainability tech, based in London, UK. Find out more at hard-stuff.com.

This library is written and provided open-source in the hope that you go on to build great things.