133 lines
3.9 KiB
C++
133 lines
3.9 KiB
C++
/*
|
|
WiFiMulti.cpp - Choose best RSSI and connect
|
|
Copyright (c) 2022 Earle F. Philhower, III
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
Modified by Ivan Grokhotkov, January 2015 - esp8266 support
|
|
*/
|
|
|
|
#include "WiFi.h"
|
|
#include <string.h>
|
|
#include <algorithm>
|
|
|
|
WiFiMulti::WiFiMulti() {
|
|
}
|
|
|
|
WiFiMulti::~WiFiMulti() {
|
|
while (!_list.empty()) {
|
|
struct _AP ap = _list.front();
|
|
_list.pop_front();
|
|
free(ap.ssid);
|
|
free(ap.pass);
|
|
}
|
|
}
|
|
|
|
bool WiFiMulti::addAP(const char *ssid, const char *pass) {
|
|
struct _AP ap;
|
|
if (!ssid) {
|
|
return false;
|
|
}
|
|
ap.ssid = strdup(ssid);
|
|
if (!ap.ssid) {
|
|
return false;
|
|
}
|
|
if (pass) {
|
|
ap.pass = strdup(pass);
|
|
if (!ap.pass) {
|
|
free(ap.ssid);
|
|
return false;
|
|
}
|
|
} else {
|
|
ap.pass = nullptr;
|
|
}
|
|
DEBUGV("[WIFIMULTI] Adding: '%s' %s' to list\n", ap.ssid, ap.pass);
|
|
_list.push_front(ap);
|
|
return true;
|
|
}
|
|
|
|
void WiFiMulti::clearAPList() {
|
|
while (!_list.empty()) {
|
|
struct _AP ap = _list.front();
|
|
_list.pop_front();
|
|
free(ap.ssid);
|
|
free(ap.pass);
|
|
}
|
|
}
|
|
|
|
uint8_t WiFiMulti::run(uint32_t to) {
|
|
struct _scanAP {
|
|
char *ssid;
|
|
char *psk;
|
|
uint8_t bssid[6];
|
|
int rssi;
|
|
};
|
|
std::list<struct _scanAP> _scanList;
|
|
|
|
// If we're already connected, don't re-scan/etc.
|
|
if (WiFi.status() == WL_CONNECTED) {
|
|
return WL_CONNECTED;
|
|
}
|
|
|
|
DEBUGV("[WIFIMULTI] Rescanning to build new list of APs\n");
|
|
int cnt = WiFi.scanNetworks();
|
|
if (!cnt) {
|
|
return WL_DISCONNECTED;
|
|
}
|
|
|
|
// Add all matching ones to the scanList
|
|
for (int i = 0; i < cnt; i++) {
|
|
for (auto j = _list.begin(); j != _list.end(); j++) {
|
|
if (!strcmp(j->ssid, WiFi.SSID(i))) {
|
|
_scanAP itm;
|
|
itm.ssid = j->ssid;
|
|
itm.psk = j->pass;
|
|
WiFi.BSSID(i, itm.bssid);
|
|
itm.rssi = WiFi.RSSI(i);
|
|
_scanList.push_front(itm);
|
|
}
|
|
}
|
|
}
|
|
// Sort by RSSI using C++ lambda magic
|
|
_scanList.sort([](const struct _scanAP & a, const struct _scanAP & b) {
|
|
return a.rssi > b.rssi;
|
|
});
|
|
for (auto j = _scanList.begin(); j != _scanList.end(); j++) {
|
|
DEBUGV("[WIFIMULTI] scanList: SSID: '%s' -- BSSID: '%02X%02X%02X%02X%02X%02X' -- RSSI: %d\n", j->ssid,
|
|
j->bssid[0], j->bssid[1], j->bssid[2], j->bssid[3], j->bssid[4], j->bssid[5], j->rssi);
|
|
}
|
|
|
|
// Attempt to connect to each (will be in order of decreasing RSSI)
|
|
for (auto j = _scanList.begin(); j != _scanList.end(); j++) {
|
|
DEBUGV("[WIFIMULTI] Connecting to: SSID: '%s' -- BSSID: '%02X%02X%02X%02X%02X%02X' -- RSSI: %d\n", j->ssid,
|
|
j->bssid[0], j->bssid[1], j->bssid[2], j->bssid[3], j->bssid[4], j->bssid[5], j->rssi);
|
|
uint32_t start = millis();
|
|
if (j->psk) {
|
|
WiFi.begin(j->ssid, j->psk, j->bssid);
|
|
} else {
|
|
WiFi.beginBSSID(j->ssid, j->bssid);
|
|
}
|
|
while (!WiFi.connected() && (millis() - start < to)) {
|
|
delay(5);
|
|
}
|
|
if (WiFi.status() == WL_CONNECTED) {
|
|
return WL_CONNECTED;
|
|
}
|
|
}
|
|
|
|
// Failed at this point...
|
|
return WiFi.status();
|
|
}
|