スズラボ通信（Vol.56掲載）

著者：すずきひろのぶ

今回は、開発ボード「ESP32-DevKitC v2」の省電力モードに挑戦してみた奮戦記の前半部分です。プログラミング設定から、まずWi-Fiが動くまでの流れを追ってみます。次回は、省電力のためにDeep SleepやLight Sleepに移行した際にWi-Fiはどんな動作となるのかを試行錯誤した結果を紹します。

シェルスクリプトマガジン Vol.56は以下のリンク先でご購入できます。

// Hironobu SUZUKI
// <suzuki.hironobu@gmail.com>
// SUZULABO for Shell Script Magazine
#include <WiFi.h>
#include <WiFiUdp.h>
#define SENDBUFSIZE 32
#define SLEEPTIME  3
char ssid[] = "XXXXXXXXXXX";
char pass[] = "XXXXXXXXXXX";
const char remoteIpAddr[] = "192.168.100.6";
const int port = 21231;
uint8_t  sendBuffer[SENDBUFSIZE];
int counter = 1;
int status = WL_IDLE_STATUS;
WiFiUDP udp;
void setup() {
  Serial.begin(115200);
  ConnectionManage();
  udp.begin(port);
}
void loop() {
  for (int j = 0; j < SENDBUFSIZE; j++) {
    sendBuffer[j] = 0;
  }
  sendBuffer[0] = counter;
  sendBuffer[1] = '\0';
  udp.beginPacket(remoteIpAddr, port);
  udp.write(sendBuffer, sizeof(sendBuffer));
  udp.endPacket();
  Serial.println(counter++);
  delay(SLEEPTIME * 1000);
}

void ConnectionManage() {
  if (  status == WL_IDLE_STATUS) {
    Serial.print("Try to connect WiFi...");
    Serial.println(ssid);
    while ( true ) {
      status = WiFi.begin(ssid, pass);
      if (  status == WL_CONNECTED ) {
        break;
      }
      Serial.println("Retry");
    }
    Serial.println("==Connected==");
    printWifiStatus();
    return;
  }
  return;
}
void printWifiStatus() {
  String myssid;
  while (true) {
    myssid = WiFi.SSID();
    if (myssid != "" ) {
      break;
    }
    delay(3000);
  }
  Serial.print("SSID: ");
  Serial.println(myssid);
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);
}

// Hironobu SUZUKI

// <suzuki.hironobu@gmail.com>

// SUZULABO for Shell Script Magazine

#include <WiFi.h>

#include <WiFiUdp.h>

#define SENDBUFSIZE 32

#define SLEEPTIME 3

char ssid[] = "XXXXXXXXXXX";

char pass[] = "XXXXXXXXXXX";

const char remoteIpAddr[] = "192.168.100.6";

const int port = 21231;

uint8_t sendBuffer[SENDBUFSIZE];

int counter = 1;

int status = WL_IDLE_STATUS;

WiFiUDP udp;

void setup() {

Serial.begin(115200);

ConnectionManage();

udp.begin(port);

}

void loop() {

for (int j = 0; j < SENDBUFSIZE; j++) {

sendBuffer[j] = 0;

}

sendBuffer[0] = counter;

sendBuffer[1] = '\0';

udp.beginPacket(remoteIpAddr, port);

udp.write(sendBuffer, sizeof(sendBuffer));

udp.endPacket();

Serial.println(counter++);

delay(SLEEPTIME * 1000);

}

void ConnectionManage() {

if ( status == WL_IDLE_STATUS) {

Serial.print("Try to connect WiFi...");

Serial.println(ssid);

while ( true ) {

status = WiFi.begin(ssid, pass);

if ( status == WL_CONNECTED ) {

break;

}

Serial.println("Retry");

}

Serial.println("==Connected==");

printWifiStatus();

return;

}

return;

}

void printWifiStatus() {

String myssid;

while (true) {

myssid = WiFi.SSID();

if (myssid != "" ) {

break;

}

delay(3000);

}

Serial.print("SSID: ");

Serial.println(myssid);

IPAddress ip = WiFi.localIP();

Serial.print("IP Address: ");

Serial.println(ip);

}

typedef enum {
  WL_IDLE_STATUS = 0,
  WL_NO_SSID_AVAIL = 1,
  WL_SCAN_COMPLETED = 2,
  WL_CONNECTED = 3,
  WL_CONNECT_FAILED = 4,
  WL_CONNECTION_LOST = 5,
  WL_DISCONNECTED = 6
} wl_status_t;

typedef enum {

WL_IDLE_STATUS = 0,

WL_NO_SSID_AVAIL = 1,

WL_SCAN_COMPLETED = 2,

WL_CONNECTED = 3,

WL_CONNECT_FAILED = 4,

WL_CONNECTION_LOST = 5,

WL_DISCONNECTED = 6

} wl_status_t;

#!/usr/bin/python3
from socket import *
import sys
import datetime
HOST = ''
PORT = 21231
s = socket(AF_INET,SOCK_DGRAM)
s.bind((HOST, PORT))
while True:
  msg, address = s.recvfrom(32)
  now = datetime.datetime.now()
  count = int(msg[0]);
  print(now.strftime("%Y/%m/%d %H:%M:%S"), count)
s.close()
sys.exit()

#!/usr/bin/python3

from socket import *

import sys

import datetime

HOST = ''

PORT = 21231

s = socket(AF_INET,SOCK_DGRAM)

s.bind((HOST, PORT))

while True:

msg, address = s.recvfrom(32)

now = datetime.datetime.now()

count = int(msg[0]);

print(now.strftime("%Y/%m/%d %H:%M:%S"), count)

s.close()

sys.exit()