#include <WiFi.h>
#include <ArduinoJson.h>
//#include "sh2lib.h"

extern "C" {
#include "sh2lib.h"
}

#define SWITCH_PIN 4

const char* ssid = "aaa";
const char* password = "sss";
const char* URL = "http://192.168.1.12:8080";
const char* UPLOAD = "/upload";

const char* ntpServer = "pool.ntp.org";
const char *timezoneEST = "EST5EDT,M3.2.0/2,M11.1.0";
const long gmtOffset_sec = 3600;
const int daylightOffset_sec = 3600;

int layer = 1;
int job_id = 1; //1000 layers will be trigger to end
unsigned long job_order = 1; //10 jobs to update one layer

StaticJsonDocument<128> doc; // for JSON data
char toSend[128];

struct sh2lib_handle hd;

int handle_post_response(struct sh2lib_handle *handle, const char *data, size_t len, int flags)
{
if (len > 0) {
Serial.printf("%.*s\n", len, data);
}

if (flags == DATA_RECV_RST_STREAM) {
 Serial.println("STREAM CLOSED");
}
return 0;

}

int send_json_data(struct sh2lib_handle *handle, char *buf, size_t length, uint32_t *data_flags)
{
int copylen = strlen(toSend);
if (copylen < length) {
memcpy(buf, toSend, copylen); //TODO: replace this directly points to toSend to see whether it works or not
} else {
copylen = 0;
}
*data_flags |= NGHTTP2_DATA_FLAG_EOF;

return copylen;

}

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
pinMode(SWITCH_PIN, INPUT);
// pinMode(SWITCH_PIN2, INPUT);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);

if (WiFi.waitForConnectResult() != WL_CONNECTED) {
Serial.println("WiFi Failed!");
return;
}

Serial.println();
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());
Serial.println(WiFi.softAPIP());

if (sh2lib_connect(&hd, URL) != ESP_OK) {
Serial.println("Error connecting to HTTP2 server");
return;
}
doc["Machine_ID"] = 5;
}

void loop() {
// put your main code here, to run repeatedly:
float x_pos = (float)random(0,25);
float y_pos = (float)random(0,25);
float x_act = x_pos * random(0,2);
float y_act = y_pos * random(0,2);

if(digitalRead(SWITCH_PIN) == HIGH && job_order <= 4294967295){

doc["Job_ID"] = job_id;
doc["Job_order"] = job_order;
doc["Layer"] = layer;
doc["X_pos"] = x_pos;
doc["Y_pos"] = y_pos;
doc["X_act"] = x_act;
doc["Y_act"] = y_act;
serializeJson(doc, Serial);
Serial.println();
serializeJson(doc, toSend);
sh2lib_do_post(&hd, UPLOAD, send_json_data, handle_post_response);
if(job_order % 10 == 0){
 layer++;
 //job_order = 1;
} 
job_order++;
if(layer == 1000){
 //job_order = 1;
 job_id++;
 layer = 1;
} 
//delay(1); //ms

}

}

The current support for HTTP/2 is through the ESP-IDF and not from Arduino API. You can use the ESP-IDF APIs inside your Arduino code.

Here is a starting point: #1130 (comment)

The Arduino API for HTTP/2 will be implemented in a future release of the Arduino-ESP32 Core.