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bc3daef76d
Improve resume speed by passing in last known BSSID Provide a simpler example for WIFI_SHUTDOWN/WIFI_RESUME Add documentation for WIFI_SHUTDOWN and WIFI_RESUME.
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
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// Demonstrate the use of WiFi.mode(WIFI_SHUTDOWN)/WiFi.mode(WIFI_RESUME)
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// Released to public domain
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// Current on WEMOS D1 mini (including: LDO, usbserial chip):
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// ~85mA during normal operations
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// ~30mA during wifi shutdown
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// ~5mA during deepsleep
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#ifndef STASSID
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#define STASSID "mynetwork"
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#define STAPSK "mynetworkpasswd"
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#endif
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#ifndef RTC_USER_DATA_SLOT_WIFI_STATE
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#define RTC_USER_DATA_SLOT_WIFI_STATE 33u
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#endif
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#include <ESP8266WiFi.h>
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#include <include/WiFiState.h> // WiFiState structure details
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WiFiState state;
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const char* ssid = STASSID;
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const char* password = STAPSK;
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void preinit(void) {
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// Make sure, wifi stays off after boot.
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ESP8266WiFiClass::preinitWiFiOff();
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}
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void setup() {
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Serial.begin(74880);
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//Serial.setDebugOutput(true); // If you need debug output
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Serial.println("Trying to resume WiFi connection...");
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// May be necessary after deepSleep. Otherwise you may get "error: pll_cal exceeds 2ms!!!" when trying to connect
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delay(1);
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// ---
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// Here you can do whatever you need to do that doesn't need a WiFi connection.
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// ---
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ESP.rtcUserMemoryRead(RTC_USER_DATA_SLOT_WIFI_STATE, reinterpret_cast<uint32_t *>(&state), sizeof(state));
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unsigned long start = millis();
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if (!WiFi.mode(WIFI_RESUME, &state)
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|| (WiFi.waitForConnectResult(10000) != WL_CONNECTED)) {
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Serial.println("Cannot resume WiFi connection, connecting via begin...");
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WiFi.persistent(false);
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if (!WiFi.mode(WIFI_STA)
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|| !WiFi.begin(ssid, password)
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|| (WiFi.waitForConnectResult(10000) != WL_CONNECTED)) {
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WiFi.mode(WIFI_OFF);
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Serial.println("Cannot connect!");
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Serial.flush();
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ESP.deepSleep(10e6, RF_DISABLED);
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return;
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}
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}
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unsigned long duration = millis() - start;
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Serial.printf("Duration: %f", duration * 0.001);
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Serial.println();
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// ---
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// Here you can do whatever you need to do that needs a WiFi connection.
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// ---
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WiFi.mode(WIFI_SHUTDOWN, &state);
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ESP.rtcUserMemoryWrite(RTC_USER_DATA_SLOT_WIFI_STATE, reinterpret_cast<uint32_t *>(&state), sizeof(state));
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// ---
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// Here you can do whatever you need to do that doesn't need a WiFi connection anymore.
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// ---
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Serial.println("Done.");
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Serial.flush();
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ESP.deepSleep(10e6, RF_DISABLED);
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}
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void loop() {
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// Nothing to do here.
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} |