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CommandStation-EX/WifiESP32.cpp

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/*
© 2023 Paul M. Antoine
© 2021 Harald Barth
© 2023 Nathan Kellenicki
This file is part of CommandStation-EX
This is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
#if defined(ARDUINO_ARCH_ESP32)
#include <vector>
#include "defines.h"
#include "ESPmDNS.h"
#include <WiFi.h>
#include "esp_wifi.h"
#include "WifiESP32.h"
#include "DIAG.h"
#include "RingStream.h"
#include "CommandDistributor.h"
#include "WiThrottle.h"
/*
#include "soc/rtc_wdt.h"
#include "esp_task_wdt.h"
*/
#include "soc/timer_group_struct.h"
#include "soc/timer_group_reg.h"
void feedTheDog0(){
// feed dog 0
TIMERG0.wdt_wprotect=TIMG_WDT_WKEY_VALUE; // write enable
TIMERG0.wdt_feed=1; // feed dog
TIMERG0.wdt_wprotect=0; // write protect
// feed dog 1
//TIMERG1.wdt_wprotect=TIMG_WDT_WKEY_VALUE; // write enable
//TIMERG1.wdt_feed=1; // feed dog
//TIMERG1.wdt_wprotect=0; // write protect
}
/*
void enableCoreWDT(byte core){
TaskHandle_t idle = xTaskGetIdleTaskHandleForCPU(core);
if(idle == NULL){
DIAG(F("Get idle rask on core %d failed"),core);
} else {
if(esp_task_wdt_add(idle) != ESP_OK){
DIAG(F("Failed to add Core %d IDLE task to WDT"),core);
} else {
DIAG(F("Added Core %d IDLE task to WDT"),core);
}
}
}
void disableCoreWDT(byte core){
TaskHandle_t idle = xTaskGetIdleTaskHandleForCPU(core);
if(idle == NULL || esp_task_wdt_delete(idle) != ESP_OK){
DIAG(F("Failed to remove Core %d IDLE task from WDT"),core);
}
}
*/
class NetworkClient {
public:
NetworkClient(WiFiClient c) {
wifi = c;
};
bool ok() {
return (inUse && wifi.connected());
};
bool recycle(WiFiClient c) {
if (inUse == true) return false;
// return false here until we have
// implemented a LRU timer
// if (LRU too recent) return false;
return false;
wifi = c;
inUse = true;
return true;
};
WiFiClient wifi;
bool inUse = true;
};
static std::vector<NetworkClient> clients; // a list to hold all clients
static WiFiServer *server = NULL;
static RingStream *outboundRing = new RingStream(10240);
static bool APmode = false;
#ifdef WIFI_TASK_ON_CORE0
void wifiLoop(void *){
for(;;){
WifiESP::loop();
}
}
#endif
char asciitolower(char in) {
if (in <= 'Z' && in >= 'A')
return in - ('Z' - 'z');
return in;
}
bool WifiESP::setup(const char *SSid,
const char *password,
const char *hostname,
int port,
const byte channel,
const bool forceAP) {
bool havePassword = true;
bool haveSSID = true;
bool wifiUp = false;
uint8_t tries = 40;
//#ifdef SERIAL_BT_COMMANDS
//return false;
//#endif
// tests
// enableCoreWDT(1);
// disableCoreWDT(0);
// clean start
WiFi.mode(WIFI_STA);
WiFi.disconnect(true);
// differnet settings that did not improve for haba
// WiFi.useStaticBuffers(true);
// WiFi.setScanMethod(WIFI_ALL_CHANNEL_SCAN);
// WiFi.setSortMethod(WIFI_CONNECT_AP_BY_SECURITY);
const char *yourNetwork = "Your network ";
if (strncmp(yourNetwork, SSid, 13) == 0 || strncmp("", SSid, 13) == 0)
haveSSID = false;
if (strncmp(yourNetwork, password, 13) == 0 || strncmp("", password, 13) == 0)
havePassword = false;
if (haveSSID && havePassword && !forceAP) {
WiFi.setHostname(hostname); // Strangely does not work unless we do it HERE!
WiFi.mode(WIFI_STA);
#ifdef SERIAL_BT_COMMANDS
WiFi.setSleep(true);
#else
WiFi.setSleep(false);
#endif
WiFi.setAutoReconnect(true);
WiFi.begin(SSid, password);
while (WiFi.status() != WL_CONNECTED && tries) {
Serial.print('.');
tries--;
delay(500);
}
if (WiFi.status() == WL_CONNECTED) {
DIAG(F("Wifi STA IP %s"),WiFi.localIP().toString().c_str());
wifiUp = true;
} else {
DIAG(F("Could not connect to Wifi SSID %s"),SSid);
DIAG(F("Forcing one more Wifi restart"));
esp_wifi_start();
esp_wifi_connect();
tries=40;
while (WiFi.status() != WL_CONNECTED && tries) {
Serial.print('.');
tries--;
delay(500);
}
if (WiFi.status() == WL_CONNECTED) {
DIAG(F("Wifi STA IP 2nd try %s"),WiFi.localIP().toString().c_str());
wifiUp = true;
} else {
DIAG(F("Wifi STA mode FAIL. Will revert to AP mode"));
haveSSID=false;
}
}
}
if (!haveSSID || forceAP) {
// prepare all strings
String strSSID(forceAP ? SSid : "DCCEX_");
String strPass(forceAP ? password : "PASS_");
if (!forceAP) {
String strMac = WiFi.macAddress();
strMac.remove(0,9);
strMac.replace(":","");
strMac.replace(":","");
// convert mac addr hex chars to lower case to be compatible with AT software
std::transform(strMac.begin(), strMac.end(), strMac.begin(), asciitolower);
strSSID.concat(strMac);
strPass.concat(strMac);
}
WiFi.mode(WIFI_AP);
#ifdef SERIAL_BT_COMMANDS
WiFi.setSleep(true);
#else
WiFi.setSleep(false);
#endif
if (WiFi.softAP(strSSID.c_str(),
havePassword ? password : strPass.c_str(),
channel, false, 8)) {
DIAG(F("Wifi AP SSID %s PASS %s"),strSSID.c_str(),havePassword ? password : strPass.c_str());
DIAG(F("Wifi AP IP %s"),WiFi.softAPIP().toString().c_str());
wifiUp = true;
APmode = true;
} else {
DIAG(F("Could not set up AP with Wifi SSID %s"),strSSID.c_str());
}
}
if (!wifiUp) {
DIAG(F("Wifi setup all fail (STA and AP mode)"));
// no idea to go on
return false;
}
// Now Wifi is up, register the mDNS service
if(!MDNS.begin(hostname)) {
DIAG(F("Wifi setup failed to start mDNS"));
}
if(!MDNS.addService("withrottle", "tcp", 2560)) {
DIAG(F("Wifi setup failed to add withrottle service to mDNS"));
}
server = new WiFiServer(port); // start listening on tcp port
server->begin();
// server started here
#ifdef WIFI_TASK_ON_CORE0
//start loop task
if (pdPASS != xTaskCreatePinnedToCore(
wifiLoop, /* Task function. */
"wifiLoop",/* name of task. */
10000, /* Stack size of task */
NULL, /* parameter of the task */
1, /* priority of the task */
NULL, /* Task handle to keep track of created task */
0)) { /* pin task to core 0 */
DIAG(F("Could not create wifiLoop task"));
return false;
}
// report server started after wifiLoop creation
// when everything looks good
DIAG(F("Server starting (core 0) port %d"),port);
#else
DIAG(F("Server will be started on port %d"),port);
#endif
return true;
}
const char *wlerror[] = {
"WL_IDLE_STATUS",
"WL_NO_SSID_AVAIL",
"WL_SCAN_COMPLETED",
"WL_CONNECTED",
"WL_CONNECT_FAILED",
"WL_CONNECTION_LOST",
"WL_DISCONNECTED"
};
void WifiESP::loop() {
int clientId; //tmp loop var
// really no good way to check for LISTEN especially in AP mode?
wl_status_t wlStatus;
if (APmode || (wlStatus = WiFi.status()) == WL_CONNECTED) {
// loop over all clients and remove inactive
for (clientId=0; clientId<clients.size(); clientId++){
// check if client is there and alive
if(clients[clientId].inUse && !clients[clientId].wifi.connected()) {
DIAG(F("Remove client %d"), clientId);
CommandDistributor::forget(clientId);
clients[clientId].wifi.stop();
clients[clientId].inUse = false;
//Do NOT clients.erase(clients.begin()+clientId) as
//that would mix up clientIds for later.
}
}
if (server->hasClient()) {
WiFiClient client;
while (client = server->available()) {
for (clientId=0; clientId<clients.size(); clientId++){
if (clients[clientId].recycle(client)) {
DIAG(F("Recycle client %d %s"), clientId, client.remoteIP().toString().c_str());
break;
}
}
if (clientId>=clients.size()) {
NetworkClient nc(client);
clients.push_back(nc);
DIAG(F("New client %d, %s"), clientId, client.remoteIP().toString().c_str());
}
}
}
// loop over all connected clients
for (clientId=0; clientId<clients.size(); clientId++){
if(clients[clientId].ok()) {
int len;
if ((len = clients[clientId].wifi.available()) > 0) {
// read data from client
byte cmd[len+1];
for(int i=0; i<len; i++) {
cmd[i]=clients[clientId].wifi.read();
}
cmd[len]=0;
CommandDistributor::parse(clientId,cmd,outboundRing);
}
}
} // all clients
WiThrottle::loop(outboundRing);
// something to write out?
clientId=outboundRing->read();
if (clientId >= 0) {
// We have data to send in outboundRing
// and we have a valid clientId.
// First read it out to buffer
// and then look if it can be sent because
// we can not leave it in the ring for ever
int count=outboundRing->count();
{
char buffer[count+1]; // one extra for '\0'
for(int i=0;i<count;i++) {
int c = outboundRing->read();
if (c >= 0) // Panic check, should never be false
buffer[i] = (char)c;
else {
DIAG(F("Ringread fail at %d"),i);
break;
}
}
// buffer filled, end with '\0' so we can use it as C string
buffer[count]='\0';
if((unsigned int)clientId <= clients.size() && clients[clientId].ok()) {
if (Diag::CMD || Diag::WITHROTTLE)
DIAG(F("SEND %d:%s"), clientId, buffer);
clients[clientId].wifi.write(buffer,count);
} else {
DIAG(F("Unsent(%d): %s"), clientId, buffer);
}
}
}
} else if (!APmode) { // in STA mode but not connected any more
// kick it again
if (wlStatus <= 6) {
DIAG(F("Wifi aborted with error %s. Kicking Wifi!"), wlerror[wlStatus]);
esp_wifi_start();
esp_wifi_connect();
uint8_t tries=40;
while (WiFi.status() != WL_CONNECTED && tries) {
Serial.print('.');
tries--;
delay(500);
}
} else {
// all well, probably
//DIAG(F("Running BT"));
}
}
// when loop() is running on core0 we must
// feed the core0 wdt ourselves as yield()
// is not necessarily yielding to a low
// prio task. On core1 this is not a problem
// as there the wdt is disabled by the
// arduio IDE startup routines.
if (xPortGetCoreID() == 0)
feedTheDog0();
yield();
}
#endif //ESP32
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