サンプルコード
// https://twelite.net/manuals/twelite-spot/example-sketches/advanced-examples/spot-httpbin/latest.html
// https://twelite.net/start-guides/twelite-spot/receive-from-cue.html
#include <Arduino.h>
#include <WiFiClientSecure.h>
#include <WiFiUdp.h>  //UDP を使う、NTPClient に必要
#include <Arduino_JSON.h> //JSON 文字列を扱う  ArduinoJsonとは異なる
#include <HTTPClient.h> //HTTPクライアント　JsonのPOSTに必要
#include <MWings.h>// Mono Wireless TWELITE Wings API for 32-bit Arduinosライブラリをインクルード
#include "src/NTPClient/NTPClient.h" //現在時刻を取得するためにNTPを使う
//#include <time.h>

// TWELITE on the SPOT
static const int RST_PIN = 5;
static const int PRG_PIN = 4;
static const int LED_PIN = 18;

// Interfaces
static WiFiClientSecure client;
static WiFiUDP ntpUDP;
static NTPClient timeClient(ntpUDP); // JST(UTC+9)

// TWELITE
void onAppAriaPacket(const ParsedAppAriaPacket& packet);

// System Setup
void setup() {
  Serial.begin(115200);
  Serial2.begin(115200);
  WiFi.begin("WIFIのSSID", "WIFIのPASSWORD");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");

  if (Twelite.begin(Serial2, LED_PIN, RST_PIN, PRG_PIN, 18, 0x67720102)) {
    Serial.println("Started TWELITE.");
  }

  Twelite.on([](const ParsedAppCuePacket & packet) {
    timeClient.begin();
    timeClient.update();
    Serial.println("u32SourceSerialId:" + String(packet.u32SourceSerialId, DEC));
    Serial.println("u8SourceLogicalId:" + String(packet.u8SourceLogicalId, HEX));
    Serial.println("u16SequenceNumber:" + String(packet.u16SequenceNumber, DEC));
    Serial.println("u8Lqi:" + String(packet.u8Lqi, DEC));
    Serial.println("u16SupplyVoltage:" + String(packet.u16SupplyVoltage, DEC) + " mV");
    Serial.println("u8AccelEvent:" + String(packet.u8AccelEvent));
    Serial.println("bHasAccelEvent:" + String(packet.bHasAccelEvent));
    Serial.println("u8SampleCount:" + String(packet.u8SampleCount));
    Serial.println("i16SamplesX:" + String(packet.i16SamplesX[0], DEC) + " mG");
    Serial.println("i16SamplesY:" + String(packet.i16SamplesY[0], DEC) + " mG");
    Serial.println("i16SamplesZ:" + String(packet.i16SamplesZ[0], DEC) + " mG");
    Serial.println("u8MagnetState:" + String(packet.u8MagnetState));
    Serial.println("bMagnetStateChanged:" + String(packet.bMagnetStateChanged));
    Serial.println("u8MagnetState:" + String(packet.u8MagnetState));
    Serial.println("bMagnetStateChanged:" + String(packet.bMagnetStateChanged));
    Serial.println("unixtime:" + String(timeClient.getEpochTime()));

    JSONVar jsonData;
    jsonData["u32SourceSerialId"] = String(packet.u32SourceSerialId, DEC); //送信元のシリアルID
    jsonData["u8SourceLogicalId"] = String(packet.u8SourceLogicalId, HEX); //  送信元の論理デバイスID
    jsonData["u16SequenceNumber"] = String(packet.u16SequenceNumber, DEC); //シーケンス番号
    jsonData["u8Lqi"] = String(packet.u8Lqi, DEC);  //電波通信品質 50未満(悪い -80dbm 未満)、50～100(やや悪い)、100～150(良好)、150以上(アンテナの近傍)
    jsonData["u16SupplyVoltage"] = String(packet.u16SupplyVoltage, DEC) + "mV"; //電源電圧mV
    jsonData["u8AccelEvent"] = packet.u8AccelEvent;
    jsonData["bHasAccelEvent"] = packet.bHasAccelEvent;
    jsonData["i16SamplesX_0"] = packet.i16SamplesX[0];
    jsonData["i16SamplesY_0"] = packet.i16SamplesY[0];
    jsonData["i16SamplesZ_0"] = packet.i16SamplesZ[0];
    jsonData["u8MagnetState"] = packet.u8MagnetState; //磁気イベントID
    jsonData["bMagnetStateChanged"] = packet.bMagnetStateChanged; //磁気イベントID
    jsonData["unixtime"] = String(timeClient.getEpochTime());
    String json = JSON.stringify(jsonData);
    HTTPClient http;
    Serial.println(json);
    Serial.println("http://hogehoge.com?json=" + json);
    http.begin("http://hogehoge.com?json=" + json);
    int status_code = http.GET();  //POST
    Serial.println("status:" + status_code);
    if ( status_code == 200 ) { //200以外ではシリアルにエラーを出力
      Serial.println("[POST]Send to server");
    } else {
      Serial.println("[POST]failed to send to server");
    }
    http.end();
  });
}

void loop() {
  Twelite.update();
}