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630 lines
20 KiB
630 lines
20 KiB
/*
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UTILS MODULE
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Copyright (C) 2017-2019 by Xose Pérez <xose dot perez at gmail dot com>
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*/
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#include <Ticker.h>
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#include "libs/HeapStats.h"
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String getIdentifier() {
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char buffer[20];
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snprintf_P(buffer, sizeof(buffer), PSTR("%s-%06X"), APP_NAME, ESP.getChipId());
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return String(buffer);
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}
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void setDefaultHostname() {
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if (strlen(HOSTNAME) > 0) {
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setSetting("hostname", HOSTNAME);
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} else {
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setSetting("hostname", getIdentifier());
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}
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}
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void setBoardName() {
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#ifndef ESPURNA_CORE
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setSetting("boardName", DEVICE_NAME);
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#endif
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}
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String getBoardName() {
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return getSetting("boardName", DEVICE_NAME);
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}
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String getAdminPass() {
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return getSetting("adminPass", ADMIN_PASS);
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}
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String getCoreVersion() {
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String version = ESP.getCoreVersion();
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#ifdef ARDUINO_ESP8266_RELEASE
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if (version.equals("00000000")) {
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version = String(ARDUINO_ESP8266_RELEASE);
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}
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#endif
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version.replace("_", ".");
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return version;
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}
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String getCoreRevision() {
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#ifdef ARDUINO_ESP8266_GIT_VER
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return String(ARDUINO_ESP8266_GIT_VER, 16);
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#else
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return String("");
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#endif
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}
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unsigned char getHeartbeatMode() {
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return getSetting("hbMode", HEARTBEAT_MODE).toInt();
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}
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unsigned char getHeartbeatInterval() {
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return getSetting("hbInterval", HEARTBEAT_INTERVAL).toInt();
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}
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String getEspurnaModules() {
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return FPSTR(espurna_modules);
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}
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#if SENSOR_SUPPORT
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String getEspurnaSensors() {
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return FPSTR(espurna_sensors);
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}
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#endif
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String getEspurnaWebUI() {
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return FPSTR(espurna_webui);
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}
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String buildTime() {
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#if NTP_SUPPORT
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return ntpDateTime(__UNIX_TIMESTAMP__);
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#else
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char buffer[20];
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snprintf_P(
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buffer, sizeof(buffer), PSTR("%04d-%02d-%02d %02d:%02d:%02d"),
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__TIME_YEAR__, __TIME_MONTH__, __TIME_DAY__,
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__TIME_HOUR__, __TIME_MINUTE__, __TIME_SECOND__
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);
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return String(buffer);
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#endif
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}
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unsigned long getUptime() {
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static unsigned long last_uptime = 0;
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static unsigned char uptime_overflows = 0;
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if (millis() < last_uptime) ++uptime_overflows;
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last_uptime = millis();
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unsigned long uptime_seconds = uptime_overflows * (UPTIME_OVERFLOW / 1000) + (last_uptime / 1000);
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return uptime_seconds;
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}
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// -----------------------------------------------------------------------------
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// Heartbeat helper
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// -----------------------------------------------------------------------------
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namespace Heartbeat {
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enum Report : uint32_t {
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Status = 1 << 1,
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Ssid = 1 << 2,
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Ip = 1 << 3,
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Mac = 1 << 4,
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Rssi = 1 << 5,
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Uptime = 1 << 6,
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Datetime = 1 << 7,
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Freeheap = 1 << 8,
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Vcc = 1 << 9,
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Relay = 1 << 10,
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Light = 1 << 11,
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Hostname = 1 << 12,
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App = 1 << 13,
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Version = 1 << 14,
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Board = 1 << 15,
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Loadavg = 1 << 16,
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Interval = 1 << 17,
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Description = 1 << 18,
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Range = 1 << 19,
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Remote_temp = 1 << 20
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};
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constexpr uint32_t defaultValue() {
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return (Status * (HEARTBEAT_REPORT_STATUS)) | \
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(Ssid * (HEARTBEAT_REPORT_SSID)) | \
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(Ip * (HEARTBEAT_REPORT_IP)) | \
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(Mac * (HEARTBEAT_REPORT_MAC)) | \
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(Rssi * (HEARTBEAT_REPORT_RSSI)) | \
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(Uptime * (HEARTBEAT_REPORT_UPTIME)) | \
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(Datetime * (HEARTBEAT_REPORT_DATETIME)) | \
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(Freeheap * (HEARTBEAT_REPORT_FREEHEAP)) | \
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(Vcc * (HEARTBEAT_REPORT_VCC)) | \
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(Relay * (HEARTBEAT_REPORT_RELAY)) | \
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(Light * (HEARTBEAT_REPORT_LIGHT)) | \
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(Hostname * (HEARTBEAT_REPORT_HOSTNAME)) | \
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(Description * (HEARTBEAT_REPORT_DESCRIPTION)) | \
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(App * (HEARTBEAT_REPORT_APP)) | \
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(Version * (HEARTBEAT_REPORT_VERSION)) | \
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(Board * (HEARTBEAT_REPORT_BOARD)) | \
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(Loadavg * (HEARTBEAT_REPORT_LOADAVG)) | \
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(Interval * (HEARTBEAT_REPORT_INTERVAL)) | \
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(Range * (HEARTBEAT_REPORT_RANGE)) | \
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(Remote_temp * (HEARTBEAT_REPORT_REMOTE_TEMP));
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}
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uint32_t currentValue() {
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const String cfg = getSetting("hbReport");
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if (!cfg.length()) return defaultValue();
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return strtoul(cfg.c_str(), NULL, 10);
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}
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}
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void heartbeat() {
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unsigned long uptime_seconds = getUptime();
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heap_stats_t heap_stats = getHeapStats();
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UNUSED(uptime_seconds);
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UNUSED(heap_stats);
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#if MQTT_SUPPORT
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unsigned char _heartbeat_mode = getHeartbeatMode();
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bool serial = !mqttConnected();
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#else
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bool serial = true;
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#endif
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// -------------------------------------------------------------------------
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// Serial
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// -------------------------------------------------------------------------
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if (serial) {
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DEBUG_MSG_P(PSTR("[MAIN] Uptime: %lu seconds\n"), uptime_seconds);
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infoHeapStats();
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#if ADC_MODE_VALUE == ADC_VCC
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DEBUG_MSG_P(PSTR("[MAIN] Power: %lu mV\n"), ESP.getVcc());
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#endif
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#if NTP_SUPPORT
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if (ntpSynced()) DEBUG_MSG_P(PSTR("[MAIN] Time: %s\n"), (char *) ntpDateTime().c_str());
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#endif
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}
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const uint32_t hb_cfg = Heartbeat::currentValue();
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if (!hb_cfg) return;
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// -------------------------------------------------------------------------
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// MQTT
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// -------------------------------------------------------------------------
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#if MQTT_SUPPORT
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if (!serial && (_heartbeat_mode == HEARTBEAT_REPEAT || systemGetHeartbeat())) {
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if (hb_cfg & Heartbeat::Interval)
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mqttSend(MQTT_TOPIC_INTERVAL, String(getHeartbeatInterval() / 1000).c_str());
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if (hb_cfg & Heartbeat::App)
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mqttSend(MQTT_TOPIC_APP, APP_NAME);
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if (hb_cfg & Heartbeat::Version)
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mqttSend(MQTT_TOPIC_VERSION, APP_VERSION);
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if (hb_cfg & Heartbeat::Board)
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mqttSend(MQTT_TOPIC_BOARD, getBoardName().c_str());
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if (hb_cfg & Heartbeat::Hostname)
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mqttSend(MQTT_TOPIC_HOSTNAME, getSetting("hostname", getIdentifier()).c_str());
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if (hb_cfg & Heartbeat::Description) {
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if (hasSetting("desc")) {
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mqttSend(MQTT_TOPIC_DESCRIPTION, getSetting("desc").c_str());
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}
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}
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if (hb_cfg & Heartbeat::Ssid)
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mqttSend(MQTT_TOPIC_SSID, WiFi.SSID().c_str());
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if (hb_cfg & Heartbeat::Ip)
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mqttSend(MQTT_TOPIC_IP, getIP().c_str());
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if (hb_cfg & Heartbeat::Mac)
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mqttSend(MQTT_TOPIC_MAC, WiFi.macAddress().c_str());
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if (hb_cfg & Heartbeat::Rssi)
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mqttSend(MQTT_TOPIC_RSSI, String(WiFi.RSSI()).c_str());
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if (hb_cfg & Heartbeat::Uptime)
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mqttSend(MQTT_TOPIC_UPTIME, String(uptime_seconds).c_str());
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#if NTP_SUPPORT
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if ((hb_cfg & Heartbeat::Datetime) && (ntpSynced()))
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mqttSend(MQTT_TOPIC_DATETIME, ntpDateTime().c_str());
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#endif
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if (hb_cfg & Heartbeat::Freeheap)
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mqttSend(MQTT_TOPIC_FREEHEAP, String(heap_stats.available).c_str());
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if (hb_cfg & Heartbeat::Relay)
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relayMQTT();
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#if (LIGHT_PROVIDER != LIGHT_PROVIDER_NONE)
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if (hb_cfg & Heartbeat::Light)
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lightMQTT();
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#endif
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if ((hb_cfg & Heartbeat::Vcc) && (ADC_MODE_VALUE == ADC_VCC))
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mqttSend(MQTT_TOPIC_VCC, String(ESP.getVcc()).c_str());
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if (hb_cfg & Heartbeat::Status)
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mqttSend(MQTT_TOPIC_STATUS, MQTT_STATUS_ONLINE, true);
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if (hb_cfg & Heartbeat::Loadavg)
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mqttSend(MQTT_TOPIC_LOADAVG, String(systemLoadAverage()).c_str());
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#if THERMOSTAT_SUPPORT
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if (hb_cfg & Heartbeat::Range) {
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mqttSend(MQTT_TOPIC_HOLD_TEMP "_" MQTT_TOPIC_HOLD_TEMP_MIN, String(_temp_range.min).c_str());
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mqttSend(MQTT_TOPIC_HOLD_TEMP "_" MQTT_TOPIC_HOLD_TEMP_MAX, String(_temp_range.max).c_str());
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}
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if (hb_cfg & Heartbeat::Remote_temp) {
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char remote_temp[6];
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dtostrf(_remote_temp.temp, 1-sizeof(remote_temp), 1, remote_temp);
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mqttSend(MQTT_TOPIC_REMOTE_TEMP, String(remote_temp).c_str());
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}
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#endif
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} else if (!serial && _heartbeat_mode == HEARTBEAT_REPEAT_STATUS) {
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mqttSend(MQTT_TOPIC_STATUS, MQTT_STATUS_ONLINE, true);
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}
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#endif
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// -------------------------------------------------------------------------
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// InfluxDB
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// -------------------------------------------------------------------------
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#if INFLUXDB_SUPPORT
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if (hb_cfg & Heartbeat::Uptime)
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idbSend(MQTT_TOPIC_UPTIME, String(uptime_seconds).c_str());
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if (hb_cfg & Heartbeat::Freeheap)
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idbSend(MQTT_TOPIC_FREEHEAP, String(heap_stats.available).c_str());
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if (hb_cfg & Heartbeat::Rssi)
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idbSend(MQTT_TOPIC_RSSI, String(WiFi.RSSI()).c_str());
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if ((hb_cfg & Heartbeat::Vcc) && (ADC_MODE_VALUE == ADC_VCC))
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idbSend(MQTT_TOPIC_VCC, String(ESP.getVcc()).c_str());
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if (hb_cfg & Heartbeat::Loadavg)
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idbSend(MQTT_TOPIC_LOADAVG, String(systemLoadAverage()).c_str());
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if (hb_cfg & Heartbeat::Ssid)
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idbSend(MQTT_TOPIC_SSID, WiFi.SSID().c_str());
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#endif
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}
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// -----------------------------------------------------------------------------
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// INFO
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// -----------------------------------------------------------------------------
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extern "C" uint32_t _SPIFFS_start;
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extern "C" uint32_t _SPIFFS_end;
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unsigned int info_bytes2sectors(size_t size) {
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return (int) (size + SPI_FLASH_SEC_SIZE - 1) / SPI_FLASH_SEC_SIZE;
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}
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unsigned long info_ota_space() {
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return (ESP.getFreeSketchSpace() - 0x1000) & 0xFFFFF000;
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}
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unsigned long info_filesystem_space() {
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return ((uint32_t)&_SPIFFS_end - (uint32_t)&_SPIFFS_start);
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}
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unsigned long info_eeprom_space() {
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return EEPROMr.reserved() * SPI_FLASH_SEC_SIZE;
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}
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void _info_print_memory_layout_line(const char * name, unsigned long bytes, bool reset) {
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static unsigned long index = 0;
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if (reset) index = 0;
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if (0 == bytes) return;
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unsigned int _sectors = info_bytes2sectors(bytes);
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DEBUG_MSG_P(PSTR("[MAIN] %-20s: %8lu bytes / %4d sectors (%4d to %4d)\n"), name, bytes, _sectors, index, index + _sectors - 1);
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index += _sectors;
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}
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void _info_print_memory_layout_line(const char * name, unsigned long bytes) {
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_info_print_memory_layout_line(name, bytes, false);
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}
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void infoMemory(const char * name, unsigned int total_memory, unsigned int free_memory) {
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DEBUG_MSG_P(
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PSTR("[MAIN] %-6s: %5u bytes initially | %5u bytes used (%2u%%) | %5u bytes free (%2u%%)\n"),
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name,
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total_memory,
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total_memory - free_memory,
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100 * (total_memory - free_memory) / total_memory,
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free_memory,
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100 * free_memory / total_memory
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);
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}
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const char* _info_wifi_sleep_mode(WiFiSleepType_t type) {
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switch (type) {
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case WIFI_NONE_SLEEP: return "NONE";
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case WIFI_LIGHT_SLEEP: return "LIGHT";
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case WIFI_MODEM_SLEEP: return "MODEM";
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default: return "UNKNOWN";
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}
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}
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void info() {
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DEBUG_MSG_P(PSTR("\n\n---8<-------\n\n"));
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// -------------------------------------------------------------------------
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#if defined(APP_REVISION)
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DEBUG_MSG_P(PSTR("[MAIN] " APP_NAME " " APP_VERSION " (" APP_REVISION ")\n"));
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#else
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DEBUG_MSG_P(PSTR("[MAIN] " APP_NAME " " APP_VERSION "\n"));
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#endif
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DEBUG_MSG_P(PSTR("[MAIN] " APP_AUTHOR "\n"));
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DEBUG_MSG_P(PSTR("[MAIN] " APP_WEBSITE "\n\n"));
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DEBUG_MSG_P(PSTR("[MAIN] CPU chip ID: 0x%06X\n"), ESP.getChipId());
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DEBUG_MSG_P(PSTR("[MAIN] CPU frequency: %u MHz\n"), ESP.getCpuFreqMHz());
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DEBUG_MSG_P(PSTR("[MAIN] SDK version: %s\n"), ESP.getSdkVersion());
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DEBUG_MSG_P(PSTR("[MAIN] Core version: %s\n"), getCoreVersion().c_str());
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DEBUG_MSG_P(PSTR("[MAIN] Core revision: %s\n"), getCoreRevision().c_str());
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DEBUG_MSG_P(PSTR("[MAIN] Build time: %lu\n"), __UNIX_TIMESTAMP__);
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DEBUG_MSG_P(PSTR("\n"));
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// -------------------------------------------------------------------------
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FlashMode_t mode = ESP.getFlashChipMode();
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UNUSED(mode);
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DEBUG_MSG_P(PSTR("[MAIN] Flash chip ID: 0x%06X\n"), ESP.getFlashChipId());
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DEBUG_MSG_P(PSTR("[MAIN] Flash speed: %u Hz\n"), ESP.getFlashChipSpeed());
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DEBUG_MSG_P(PSTR("[MAIN] Flash mode: %s\n"), mode == FM_QIO ? "QIO" : mode == FM_QOUT ? "QOUT" : mode == FM_DIO ? "DIO" : mode == FM_DOUT ? "DOUT" : "UNKNOWN");
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DEBUG_MSG_P(PSTR("\n"));
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// -------------------------------------------------------------------------
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_info_print_memory_layout_line("Flash size (CHIP)", ESP.getFlashChipRealSize(), true);
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_info_print_memory_layout_line("Flash size (SDK)", ESP.getFlashChipSize(), true);
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_info_print_memory_layout_line("Reserved", 1 * SPI_FLASH_SEC_SIZE, true);
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_info_print_memory_layout_line("Firmware size", ESP.getSketchSize());
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_info_print_memory_layout_line("Max OTA size", info_ota_space());
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_info_print_memory_layout_line("SPIFFS size", info_filesystem_space());
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_info_print_memory_layout_line("EEPROM size", info_eeprom_space());
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_info_print_memory_layout_line("Reserved", 4 * SPI_FLASH_SEC_SIZE);
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DEBUG_MSG_P(PSTR("\n"));
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// -------------------------------------------------------------------------
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#if SPIFFS_SUPPORT
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FSInfo fs_info;
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bool fs = SPIFFS.info(fs_info);
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if (fs) {
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DEBUG_MSG_P(PSTR("[MAIN] SPIFFS total size : %8u bytes / %4d sectors\n"), fs_info.totalBytes, info_bytes2sectors(fs_info.totalBytes));
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DEBUG_MSG_P(PSTR("[MAIN] used size : %8u bytes\n"), fs_info.usedBytes);
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DEBUG_MSG_P(PSTR("[MAIN] block size : %8u bytes\n"), fs_info.blockSize);
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DEBUG_MSG_P(PSTR("[MAIN] page size : %8u bytes\n"), fs_info.pageSize);
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DEBUG_MSG_P(PSTR("[MAIN] max files : %8u\n"), fs_info.maxOpenFiles);
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DEBUG_MSG_P(PSTR("[MAIN] max length : %8u\n"), fs_info.maxPathLength);
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} else {
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DEBUG_MSG_P(PSTR("[MAIN] No SPIFFS partition\n"));
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}
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DEBUG_MSG_P(PSTR("\n"));
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#endif
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// -------------------------------------------------------------------------
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eepromSectorsDebug();
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DEBUG_MSG_P(PSTR("\n"));
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// -------------------------------------------------------------------------
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static bool show_frag_stats = false;
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infoMemory("EEPROM", SPI_FLASH_SEC_SIZE, SPI_FLASH_SEC_SIZE - settingsSize());
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infoHeapStats(show_frag_stats);
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infoMemory("Stack", CONT_STACKSIZE, getFreeStack());
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DEBUG_MSG_P(PSTR("\n"));
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show_frag_stats = true;
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// -------------------------------------------------------------------------
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DEBUG_MSG_P(PSTR("[MAIN] Boot version: %d\n"), ESP.getBootVersion());
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DEBUG_MSG_P(PSTR("[MAIN] Boot mode: %d\n"), ESP.getBootMode());
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unsigned char reason = customResetReason();
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if (reason > 0) {
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char buffer[32];
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strcpy_P(buffer, custom_reset_string[reason-1]);
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DEBUG_MSG_P(PSTR("[MAIN] Last reset reason: %s\n"), buffer);
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} else {
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DEBUG_MSG_P(PSTR("[MAIN] Last reset reason: %s\n"), (char *) ESP.getResetReason().c_str());
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DEBUG_MSG_P(PSTR("[MAIN] Last reset info: %s\n"), (char *) ESP.getResetInfo().c_str());
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}
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DEBUG_MSG_P(PSTR("\n"));
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// -------------------------------------------------------------------------
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DEBUG_MSG_P(PSTR("[MAIN] Board: %s\n"), getBoardName().c_str());
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DEBUG_MSG_P(PSTR("[MAIN] Support: %s\n"), getEspurnaModules().c_str());
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#if SENSOR_SUPPORT
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DEBUG_MSG_P(PSTR("[MAIN] Sensors: %s\n"), getEspurnaSensors().c_str());
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#endif // SENSOR_SUPPORT
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DEBUG_MSG_P(PSTR("[MAIN] WebUI image: %s\n"), getEspurnaWebUI().c_str());
|
|
DEBUG_MSG_P(PSTR("\n"));
|
|
|
|
// -------------------------------------------------------------------------
|
|
|
|
DEBUG_MSG_P(PSTR("[MAIN] Firmware MD5: %s\n"), (char *) ESP.getSketchMD5().c_str());
|
|
#if ADC_MODE_VALUE == ADC_VCC
|
|
DEBUG_MSG_P(PSTR("[MAIN] Power: %u mV\n"), ESP.getVcc());
|
|
#endif
|
|
if (espurnaLoopDelay()) {
|
|
DEBUG_MSG_P(PSTR("[MAIN] Power saving delay value: %lu ms\n"), espurnaLoopDelay());
|
|
}
|
|
|
|
const WiFiSleepType_t sleep_mode = WiFi.getSleepMode();
|
|
if (sleep_mode != WIFI_NONE_SLEEP) {
|
|
DEBUG_MSG_P(PSTR("[MAIN] WiFi Sleep Mode: %s\n"), _info_wifi_sleep_mode(sleep_mode));
|
|
}
|
|
|
|
// -------------------------------------------------------------------------
|
|
|
|
#if SYSTEM_CHECK_ENABLED
|
|
if (!systemCheck()) {
|
|
DEBUG_MSG_P(PSTR("\n"));
|
|
DEBUG_MSG_P(PSTR("[MAIN] Device is in SAFE MODE\n"));
|
|
}
|
|
#endif
|
|
|
|
// -------------------------------------------------------------------------
|
|
|
|
DEBUG_MSG_P(PSTR("\n\n---8<-------\n\n"));
|
|
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// SSL
|
|
// -----------------------------------------------------------------------------
|
|
|
|
#if ASYNC_TCP_SSL_ENABLED
|
|
|
|
bool sslCheckFingerPrint(const char * fingerprint) {
|
|
return (strlen(fingerprint) == 59);
|
|
}
|
|
|
|
bool sslFingerPrintArray(const char * fingerprint, unsigned char * bytearray) {
|
|
|
|
// check length (20 2-character digits ':' or ' ' separated => 20*2+19 = 59)
|
|
if (!sslCheckFingerPrint(fingerprint)) return false;
|
|
|
|
// walk the fingerprint
|
|
for (unsigned int i=0; i<20; i++) {
|
|
bytearray[i] = strtol(fingerprint + 3*i, NULL, 16);
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
bool sslFingerPrintChar(const char * fingerprint, char * destination) {
|
|
|
|
// check length (20 2-character digits ':' or ' ' separated => 20*2+19 = 59)
|
|
if (!sslCheckFingerPrint(fingerprint)) return false;
|
|
|
|
// copy it
|
|
strncpy(destination, fingerprint, 59);
|
|
|
|
// walk the fingerprint replacing ':' for ' '
|
|
for (unsigned char i = 0; i<59; i++) {
|
|
if (destination[i] == ':') destination[i] = ' ';
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// Reset
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// Use fixed method for Core 2.3.0, because it erases only 2 out of 4 SDK-reserved sectors
|
|
// Fixed since 2.4.0, see: esp8266/core/esp8266/Esp.cpp: ESP::eraseConfig()
|
|
bool eraseSDKConfig() {
|
|
#if defined(ARDUINO_ESP8266_RELEASE_2_3_0)
|
|
const size_t cfgsize = 0x4000;
|
|
size_t cfgaddr = ESP.getFlashChipSize() - cfgsize;
|
|
|
|
for (size_t offset = 0; offset < cfgsize; offset += SPI_FLASH_SEC_SIZE) {
|
|
if (!ESP.flashEraseSector((cfgaddr + offset) / SPI_FLASH_SEC_SIZE)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
#else
|
|
return ESP.eraseConfig();
|
|
#endif
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// Helper functions
|
|
// -----------------------------------------------------------------------------
|
|
|
|
char * ltrim(char * s) {
|
|
char *p = s;
|
|
while ((unsigned char) *p == ' ') ++p;
|
|
return p;
|
|
}
|
|
|
|
double roundTo(double num, unsigned char positions) {
|
|
double multiplier = 1;
|
|
while (positions-- > 0) multiplier *= 10;
|
|
return round(num * multiplier) / multiplier;
|
|
}
|
|
|
|
void nice_delay(unsigned long ms) {
|
|
unsigned long start = millis();
|
|
while (millis() - start < ms) delay(1);
|
|
}
|
|
|
|
// This method is called by the SDK to know where to connect the ADC
|
|
int __get_adc_mode() {
|
|
return (int) (ADC_MODE_VALUE);
|
|
}
|
|
|
|
bool isNumber(const char * s) {
|
|
unsigned char len = strlen(s);
|
|
if (0 == len) return false;
|
|
bool decimal = false;
|
|
bool digit = false;
|
|
for (unsigned char i=0; i<len; i++) {
|
|
if (('-' == s[i]) || ('+' == s[i])) {
|
|
if (i>0) return false;
|
|
} else if (s[i] == '.') {
|
|
if (!digit) return false;
|
|
if (decimal) return false;
|
|
decimal = true;
|
|
} else if (!isdigit(s[i])) {
|
|
return false;
|
|
} else {
|
|
digit = true;
|
|
}
|
|
}
|
|
return digit;
|
|
}
|
|
|
|
// ref: lwip2 lwip_strnstr with strnlen
|
|
char* strnstr(const char* buffer, const char* token, size_t n) {
|
|
size_t token_len = strnlen(token, n);
|
|
if (token_len == 0) {
|
|
return const_cast<char*>(buffer);
|
|
}
|
|
|
|
for (const char* p = buffer; *p && (p + token_len <= buffer + n); p++) {
|
|
if ((*p == *token) && (strncmp(p, token, token_len) == 0)) {
|
|
return const_cast<char*>(p);
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|