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raymond |
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#include <FS.h>
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#include <LittleFS.h>
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#include <AsyncFsWebServer.h>
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AsyncFsWebServer server(LittleFS, 80, "esphost");
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// Timezone definition to get properly time from NTP server
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#define MYTZ "CET-1CEST,M3.5.0,M10.5.0/3"
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#include <time.h>
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struct tm ntpTime;
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const char* basePath = "/csv";
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//////////////////////////////// Filesystem /////////////////////////////////////////
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bool startFilesystem(){
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if (LittleFS.begin()){
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server.printFileList(LittleFS, "/", 2);
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return true;
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}
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else {
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Serial.println("ERROR on mounting filesystem. It will be formmatted!");
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LittleFS.format();
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ESP.restart();
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}
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return false;
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}
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//////////////////////////// Append a row to csv file ///////////////////////////////////
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bool appenRow() {
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getLocalTime(&ntpTime, 10);
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char filename[32];
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snprintf(filename, sizeof(filename),
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"%s/%04d_%02d_%02d.csv",
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basePath,
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ntpTime.tm_year + 1900,
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ntpTime.tm_mon + 1,
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ntpTime.tm_mday
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);
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File file;
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if (LittleFS.exists(filename)) {
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file = LittleFS.open(filename, "a"); // Append to existing file
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}
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else {
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file = LittleFS.open(filename, "w"); // Create a new file
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file.println("timestamp, free heap, largest free block, connected, wifi strength");
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}
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if (file) {
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char timestamp[25];
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strftime(timestamp, sizeof(timestamp), "%c", &ntpTime);
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char row[64];
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#ifdef ESP32
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snprintf(row, sizeof(row), "%s, %d, %d, %s, %d",
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timestamp,
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heap_caps_get_free_size(0),
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heap_caps_get_largest_free_block(0),
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(WiFi.status() == WL_CONNECTED) ? "true" : "false",
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WiFi.RSSI()
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);
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#elif defined(ESP8266)
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uint32_t free;
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uint32_t max;
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ESP.getHeapStats(&free, &max, nullptr);
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snprintf(row, sizeof(row),
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"%s, %d, %d, %s, %d",
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timestamp, free, max,
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(WiFi.status() == WL_CONNECTED) ? "true" : "false",
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WiFi.RSSI()
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);
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#endif
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Serial.println(row);
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file.println(row);
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file.close();
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return true;
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}
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return false;
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}
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void setup() {
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Serial.begin(115200);
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delay(1000);
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startFilesystem();
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// Try to connect to WiFi (will start AP if not connected after timeout)
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if (!server.startWiFi(10000)) {
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Serial.println("\nWiFi not connected! Starting AP mode...");
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server.startCaptivePortal("ESP32_LOGGER", "123456789", "/setup");
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}
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// Enable ACE FS file web editor and add FS info callback fucntion
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server.enableFsCodeEditor();
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// Start server
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server.init();
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Serial.print(F("Async ESP Web Server started on IP Address: "));
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Serial.println(server.getServerIP());
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Serial.println(F(
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"This is \"scvLogger.ino\" example.\n"
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"Open /setup page to configure optional parameters.\n"
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"Open /edit page to view, edit or upload example or your custom webserver source files."
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));
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// Set NTP servers
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#ifdef ESP8266
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configTime(MYTZ, "time.google.com", "time.windows.com", "pool.ntp.org");
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#elif defined(ESP32)
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configTzTime(MYTZ, "time.google.com", "time.windows.com", "pool.ntp.org");
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#endif
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// Wait for NTP sync (with timeout)
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getLocalTime(&ntpTime, 5000);
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// Create csv logs folder if not exists
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if (!LittleFS.exists(basePath)) {
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LittleFS.mkdir(basePath);
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}
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}
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void loop() {
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if (server.isAccessPointMode())
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server.updateDNS();
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static uint32_t updateTime;
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if (millis()- updateTime > 30000) {
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updateTime = millis();
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appenRow();
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}
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}
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