##概要
GPSのRTKに必要なRTCM3データをM5StickCのWifiで拾ってきて、URATに流す。

NTRIP-client-for-Arduino
https://github.com/GLAY-AK2/NTRIP-client-for-Arduino

##ソース

ソース

/*
 *  NTRIP client for Arduino Ver. 1.0.0 
 *  NTRIPClient Sample
 *  Request Source Table (Source Table is basestation list in NTRIP Caster)
 *  Request Reference Data 
 * 
 * 
 */
//#include <ESP8266WiFi.h>  //Need for ESP8266
#include <WiFi.h>           //Need for ESP32 
#include "NTRIPClient.h"
#include "M5StickC.h"

const char* ssid     = "your_ssid";
const char* password = "your_password";

char* host = "ntrip caster host";
int httpPort = 2101; //port 2101 is default port of NTRIP caster
char* mntpnt = "ntrip caster's mountpoint";
char* user   = "ntrip caster's client user";
char* passwd = "ntrip caster's client password";
NTRIPClient ntrip_c;

void setup() {
  M5.begin();
  M5.Axp.ScreenBreath(10);    // 画面の輝度を少し下げる 
  M5.Lcd.setRotation(1);      // 左を上にする
  M5.Lcd.setTextSize(2);      // 文字サイズを2にする
  M5.Lcd.fillScreen(BLACK);   // 背景を黒にする
    
  // put your setup code here, to run once:
  Serial.begin(115200,SERIAL_8N1,0,26);
  delay(10);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  Serial.println("Requesting SourceTable.");
  if(ntrip_c.reqSrcTbl(host,httpPort)){
    char buffer[512];
    delay(5);
    while(ntrip_c.available()){
      ntrip_c.readLine(buffer,sizeof(buffer));
      Serial.print(buffer); 
    }
  }
  else{
    Serial.println("SourceTable request error");
  }
  Serial.print("Requesting SourceTable is OK\n");
  ntrip_c.stop(); //Need to call "stop" function for next request.
  
  Serial.println("Requesting MountPoint's Raw data");
  if(!ntrip_c.reqRaw(host,httpPort,mntpnt,user,passwd)){
    delay(15000);
    ESP.restart();
  }
  Serial.println("Requesting MountPoint is OK");
}

long count = 0;
long countup=0;

void loop() {
  // put your main code here, to run repeatedly:
  while(ntrip_c.available()) {
        char ch = ntrip_c.read();        
        Serial.print(ch);
        count++;
    }
    if (count > countup){
  M5.Lcd.setCursor(0, 0, 1);
  M5.Lcd.setTextSize(2);
  M5.Lcd.print("count:");
  M5.Lcd.print(count);
  countup=count;
  M5.Lcd.setTextSize(1);
  M5.Lcd.setCursor(0, 40);
  M5.Lcd.print("SSID:");
  M5.Lcd.println(ssid);
  M5.Lcd.print("NTRIP Caster http://");
  M5.Lcd.print(host);
  M5.Lcd.print(":");
  M5.Lcd.print(httpPort);
  M5.Lcd.print("/");
  M5.Lcd.println(mntpnt);
  }
}

##出力先の変更
USBコネクタの近くにあるGROVEコネクタを流用して使うとスッキリ配線できます。
https://www.switch-science.com/catalog/1048/

Serial.begin(115200,SERIAL_8N1,32,33);

##参考にしたサイト
https://ambidata.io/samples/m5stack/m5sitckc/
https://lang-ship.com/blog/?p=590
https://lang-ship.com/blog/?p=678

##ambientに流す
*未テスト

ソース

/*
 *  NTRIP client for Arduino Ver. 1.0.0 
 *  NTRIPClient Sample
 *  Request Source Table (Source Table is basestation list in NTRIP Caster)
 *  Request Reference Data 
 * 
 * 
 */
//#include <ESP8266WiFi.h>  //Need for ESP8266
#include <WiFi.h>           //Need for ESP32 
#include "NTRIPClient.h"
#include "M5StickC.h"
#include "Ambient.h"
#include "TinyGPS++.h"

const char* ssid     = "your_ssid";
const char* password = "your_password";

char* host = "ntrip caster host";
int httpPort = 2101; //port 2101 is default port of NTRIP caster
char* mntpnt = "ntrip caster's mountpoint";
char* user   = "ntrip caster's client user";
char* passwd = "ntrip caster's client password";

NTRIPClient ntrip_c;
WiFiClient connect2;

unsigned int channelId = 100;
const char* writeKey = "Ambient WriteKey";

TinyGPSPlus gps;
Ambient ambient;

void setup() {
  M5.begin();
  M5.Axp.ScreenBreath(10);    // 画面の輝度を少し下げる 
  M5.Lcd.setRotation(1);      // 左を上にする
  M5.Lcd.setTextSize(2);      // 文字サイズを2にする
  M5.Lcd.fillScreen(BLACK);   // 背景を黒にする
    
  // put your setup code here, to run once:
  Serial.begin(115200,SERIAL_8N1,32,33);
  delay(10);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  Serial.println("Requesting SourceTable.");
  if(ntrip_c.reqSrcTbl(host,httpPort)){
    char buffer[512];
    delay(5);
    while(ntrip_c.available()){
      ntrip_c.readLine(buffer,sizeof(buffer));
      Serial.print(buffer); 
    }
  }
  else{
    Serial.println("SourceTable request error");
  }
  Serial.print("Requesting SourceTable is OK\n");
  ntrip_c.stop(); //Need to call "stop" function for next request.
  
  Serial.println("Requesting MountPoint's Raw data");
  if(!ntrip_c.reqRaw(host,httpPort,mntpnt,user,passwd)){
    delay(15000);
    ESP.restart();
  }
  Serial.println("Requesting MountPoint is OK");
  ambient.begin(channelId, writeKey, &connect2 );

}

long count = 0;
long countup=0;

void loop() {
  // put your main code here, to run repeatedly:
  while(ntrip_c.available()) {
        char ch = ntrip_c.read();        
        Serial.print(ch);
        count++;
    }
    if (count > countup){
  M5.Lcd.setCursor(0, 0, 1);
  M5.Lcd.setTextSize(2);
  M5.Lcd.print("count:");
  M5.Lcd.print(count);
  countup=count;
  M5.Lcd.setTextSize(1);
  M5.Lcd.setCursor(0, 40);
  M5.Lcd.print("SSID:");
  M5.Lcd.println(ssid);
  M5.Lcd.print("NTRIP Caster http://");
  M5.Lcd.print(host);
  M5.Lcd.print(":");
  M5.Lcd.print(httpPort);
  M5.Lcd.print("/");
  M5.Lcd.println(mntpnt);
  M5.Lcd.setTextSize(3);
  }
  
        while (Serial.available() > 0) {
          if (gps.encode(Serial.read())) {
        break;
        }
    }

    char buf[16];
    if (gps.location.isValid()) {
        dtostrf(gps.altitude.meters(), 4, 2, buf);      
        ambient.set(1, buf);
        dtostrf(gps.location.lat(), 12, 8, buf);
        ambient.set(9, buf);
        dtostrf(gps.location.lng(), 12, 8, buf);
        ambient.set(10, buf);
        ambient.send();
    }
    

}