RainRadar by YOLP for M5Stack

m5stack_rainradar.ino

/*
 * Copyright (c) 2019 Kohei "Max" MATSUSHITA
 * Released under the MIT license
 * https://opensource.org/licenses/mit-license.php
*/
#include <M5Stack.h>
#define CONSOLE Serial
#define MODEM Serial2 /* Serial2 is Modem of 3G Module */
#include <string.h>

#define TINY_GSM_MODEM_UBLOX
#include <TinyGsmClient.h>
TinyGsm modem(MODEM);
TinyGsmClientSecure ctx(modem);

void modem_enabler();
void render_rain_radar();
void print_top();
void print_bottom();
uint16_t getColor(uint8_t red, uint8_t green, uint8_t blue);

void setup() {
  M5.begin();
  CONSOLE.begin(115200);
  M5.Lcd.clear(BLACK);
  M5.Lcd.setTextSize(2);
  
  print_top();
  print_bottom();
  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.setCursor(0, 16);
  M5.Lcd.println("## Congrats,");
  M5.Lcd.println("## Boot successfully!");
}

void loop() {
  if (M5.BtnA.wasReleased()) {
    M5.Lcd.setTextColor(WHITE);
    M5.Lcd.setCursor(218, 0);
    M5.Lcd.print(F("(prog..."));
    modem_enabler();
    get_and_render_rain_radar();
    print_top();
    print_bottom();
    modem.gprsDisconnect();
  }
  M5.update();
}

/* ------------------------------------------------------------*/

void modem_enabler() {
  M5.Lcd.setTextColor(WHITE);
  MODEM.begin(115200, SERIAL_8N1, 16, 17);

  M5.Lcd.fillRect(0, 224, 320, 16, BLACK); /* clean up */
  M5.Lcd.setCursor(0, 224);
  M5.Lcd.println(F("modem.restart()"));
  CONSOLE.println(F("modem.restart()"));
  modem.restart();
  
  M5.Lcd.fillRect(0, 224, 320, 16, BLACK); /* clean up */
  M5.Lcd.setCursor(0, 224);
  M5.Lcd.println(F("waitForNetwork()"));
  CONSOLE.println(F("waitForNetwork()"));
  while (!modem.waitForNetwork()) M5.Lcd.print(".");

  M5.Lcd.fillRect(0, 224, 320, 16, BLACK); /* clean up */
  M5.Lcd.setCursor(0, 224);
  M5.Lcd.println(F("gprsConnect(soracom.io)"));
  CONSOLE.println(F("gprsConnect(soracom.io)"));
  modem.gprsConnect("soracom.io", "sora", "sora");

  M5.Lcd.fillRect(0, 224, 320, 16, BLACK); /* clean up */
  M5.Lcd.setCursor(0, 224);
  M5.Lcd.println(F("isNetworkConnected()"));
  CONSOLE.println(F("isNetworkConnected()"));
  while (!modem.isNetworkConnected()) M5.Lcd.print(".");

  M5.Lcd.fillRect(0, 224, 320, 16, BLACK); /* clean up */
  M5.Lcd.setCursor(0, 224);
  M5.Lcd.print(F("MyIP:"));
  CONSOLE.print(F("MyIP: "));
  IPAddress ipaddr = modem.localIP();
  M5.Lcd.println(ipaddr);
  CONSOLE.println(ipaddr);
}

char _buf[32*1024] = {0}; /* store for JPG image data */
void get_and_render_rain_radar() {
  /* connect to host */
  const char *host = "map.yahooapis.jp";
  const int port = 443;
  int timeout_s = 60;
  CONSOLE.print("Connecting:");
  CONSOLE.println(host);
  if (!ctx.connect(host, port, timeout_s)) {
    CONSOLE.println("fail");
    return;
  }

  /* send request */
  const char *path = "GET /map/V1/static?appid=<YOUR_CLIENT_ID>&output=jpg&quality=50&width=320&height=208&overlay=type:rainfall%7Cdatelabel:off&mode=map&style=base:simple&z=8&lat=35.6313456&lon=139.7312189 HTTP/1.0";
  CONSOLE.println(path);
  ctx.println(path);
  ctx.print("Host: ");
  ctx.println(host);
  ctx.println();
  Serial.println("sent.");

  /* receive response */
  while (ctx.connected()) {
    String line = ctx.readStringUntil('\n');
    CONSOLE.println(line);
    if (line == "\r") {
      CONSOLE.println("headers received.");
      break;
    }
  }
  ctx.readBytes(_buf, sizeof(_buf)); /* body */
  ctx.stop();
  
  /* rendering */
  size_t _buf_s = strlen(_buf);
  CONSOLE.println(_buf_s);
  CONSOLE.println(_buf);
  M5.Lcd.drawJpg((const unsigned char *)_buf, _buf_s, 0, 16);
  _buf[0] = '\0'; /* cleanup */
  CONSOLE.println("done.");
}

void print_top() {
  M5.Lcd.fillRect(0, 0, 320, 16, getColor(51, 244, 204));
  M5.Lcd.setTextColor(BLACK);
  M5.Lcd.setCursor(0, 0);
  M5.Lcd.print(F("RainRadar by YOLP"));
}

void print_bottom() {
  M5.Lcd.fillRect(0, 224, 320, 16, BLACK); /* clean up */
  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.setCursor(0, 224);
  M5.Lcd.print(F("Btn => Retreve RainRadar"));
}

uint16_t getColor(uint8_t red, uint8_t green, uint8_t blue) {
  return ((red>>3)<<11) | ((green>>2)<<5) | (blue>>3);
}