107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
/*
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WiFiMulti.cpp - Choose best RSSI and connect
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Copyright (c) 2022 Earle F. Philhower, III
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified by Ivan Grokhotkov, January 2015 - esp8266 support
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*/
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#include "WiFi.h"
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#include <string.h>
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#include <algorithm>
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WiFiMulti::WiFiMulti() {
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}
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WiFiMulti::~WiFiMulti() {
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while (!_list.empty()) {
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struct _AP ap = _list.front();
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_list.pop_front();
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free(ap.ssid);
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free(ap.pass);
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}
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}
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bool WiFiMulti::addAP(const char *ssid, const char *pass) {
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struct _AP ap;
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if (!ssid) {
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return false;
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}
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ap.ssid = strdup(ssid);
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if (!ap.ssid) {
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return false;
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}
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if (pass) {
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ap.pass = strdup(pass);
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if (!ap.pass) {
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free(ap.ssid);
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return false;
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}
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} else {
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ap.pass = nullptr;
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}
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DEBUGV("[WIFIMULTI] Adding: '%s' %s' to list\n", ap.ssid, ap.pass);
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_list.push_front(ap);
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return true;
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}
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uint8_t WiFiMulti::run(uint32_t to) {
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// If we're already connected, don't re-scan/etc.
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if (WiFi.status() == WL_CONNECTED) {
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return WL_CONNECTED;
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}
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int cnt = WiFi.scanNetworks();
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if (!cnt) {
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return WL_DISCONNECTED;
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}
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// Find the highest RSSI network in our list. Probably more efficient searches, but the list
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// of APs will have < 5 in > 99% of the cases so it's a don't care.
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int maxRSSID = -999;
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std::list<struct _AP>::iterator hit;
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bool found = false;
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for (int i = 0; i < cnt; i++) {
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if (WiFi.RSSI(i) > maxRSSID) {
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for (auto j = _list.begin(); j != _list.end(); j++) {
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DEBUGV("[WIFIMULTI] Checking for '%s' at %d\n", WiFi.SSID(i), WiFi.RSSI(i));
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if (!strcmp(j->ssid, WiFi.SSID(i))) {
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hit = j;
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maxRSSID = WiFi.RSSI(i);
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found = true;
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}
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}
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}
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}
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if (!found) {
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return WL_DISCONNECTED;
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}
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// Connect!
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DEBUGV("[WIFIMULTI] Connecting to '%s' and '%s'\n", hit->ssid, hit->pass);
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uint32_t start = millis();
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if (hit->pass) {
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WiFi.begin(hit->ssid, hit->pass);
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} else {
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WiFi.begin(hit->ssid);
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}
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while (!WiFi.connected() && (millis() - start < to)) {
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delay(5);
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}
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return WiFi.status();
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}
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