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CommandStation-EX/WifiInterface.cpp

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/*
© 2020, Chris Harlow. All rights reserved.
© 2020, Harald Barth.
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/>.
*/
#include "WifiInterface.h" /* config.h included there */
#include <avr/pgmspace.h>
#include "DIAG.h"
#include "StringFormatter.h"
#include "WifiInboundHandler.h"
const char PROGMEM READY_SEARCH[] = "\r\nready\r\n";
const char PROGMEM OK_SEARCH[] = "\r\nOK\r\n";
const char PROGMEM END_DETAIL_SEARCH[] = "@ 1000";
const char PROGMEM SEND_OK_SEARCH[] = "\r\nSEND OK\r\n";
const char PROGMEM IPD_SEARCH[] = "+IPD";
const unsigned long LOOP_TIMEOUT = 2000;
bool WifiInterface::connected = false;
Stream * WifiInterface::wifiStream;
#ifndef WIFI_CONNECT_TIMEOUT
// Tested how long it takes to FAIL an unknown SSID on firmware 1.7.4.
#define WIFI_CONNECT_TIMEOUT 14000
#endif
////////////////////////////////////////////////////////////////////////////////
//
// Figure out number of serial ports depending on hardware
//
#if defined(ARDUINO_AVR_UNO)
#define NUM_SERIAL 0
#endif
#if (defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560))
#define NUM_SERIAL 3
#endif
#ifndef NUM_SERIAL
#define NUM_SERIAL 1
#endif
bool WifiInterface::setup(long serial_link_speed,
const FSH *wifiESSID,
const FSH *wifiPassword,
const FSH *hostname,
const int port) {
wifiSerialState wifiUp = WIFI_NOAT;
#if NUM_SERIAL == 0
// no warning about unused parameters.
(void) serial_link_speed;
(void) wifiESSID;
(void) wifiPassword;
(void) hostname;
(void) port;
#endif
#if NUM_SERIAL > 0
Serial1.begin(serial_link_speed);
wifiUp = setup(Serial1, wifiESSID, wifiPassword, hostname, port);
#endif
// Other serials are tried, depending on hardware.
#if NUM_SERIAL > 1
if (wifiUp == WIFI_NOAT)
{
Serial2.begin(serial_link_speed);
wifiUp = setup(Serial2, wifiESSID, wifiPassword, hostname, port);
}
#endif
#if NUM_SERIAL > 2
if (wifiUp == WIFI_NOAT)
{
Serial3.begin(serial_link_speed);
wifiUp = setup(Serial3, wifiESSID, wifiPassword, hostname, port);
}
#endif
if (wifiUp == WIFI_NOAT) // here and still not AT commands found
return false;
DCCEXParser::setAtCommandCallback(ATCommand);
// CAUTION... ONLY CALL THIS ONCE
WifiInboundHandler::setup(wifiStream);
if (wifiUp == WIFI_CONNECTED)
connected = true;
else
connected = false;
return connected;
}
wifiSerialState WifiInterface::setup(Stream & setupStream, const FSH* SSid, const FSH* password,
const FSH* hostname, int port) {
wifiSerialState wifiState;
static uint8_t ntry = 0;
ntry++;
wifiStream = &setupStream;
DIAG(F("\n++ Wifi Setup Try %d ++\n"), ntry);
wifiState = setup2( SSid, password, hostname, port);
if (wifiState == WIFI_NOAT) {
DIAG(F("\n++ Wifi Setup NO AT ++\n"));
return wifiState;
}
if (wifiState == WIFI_CONNECTED) {
StringFormatter::send(wifiStream, F("ATE0\r\n")); // turn off the echo
checkForOK(200, OK_SEARCH, true);
}
DIAG(F("\n++ Wifi Setup %S ++\n"), wifiState == WIFI_CONNECTED ? F("CONNECTED") : F("DISCONNECTED"));
return wifiState;
}
#ifdef DONT_TOUCH_WIFI_CONF
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-variable"
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif
wifiSerialState WifiInterface::setup2(const FSH* SSid, const FSH* password,
const FSH* hostname, int port) {
bool ipOK = false;
bool oldCmd = false;
char macAddress[17]; // mac address extraction
// First check... Restarting the Arduino does not restart the ES.
// There may alrerady be a connection with data in the pipeline.
// If there is, just shortcut the setup and continue to read the data as normal.
if (checkForOK(200,IPD_SEARCH, true)) {
DIAG(F("\nPreconfigured Wifi already running with data waiting\n"));
// loopstate=4; // carry on from correct place... or not as the case may be
return WIFI_CONNECTED;
}
StringFormatter::send(wifiStream, F("AT\r\n")); // Is something here that understands AT?
if(!checkForOK(200, OK_SEARCH, true))
return WIFI_NOAT; // No AT compatible WiFi module here
StringFormatter::send(wifiStream, F("ATE1\r\n")); // Turn on the echo, se we can see what's happening
checkForOK(2000, OK_SEARCH, true); // Makes this visible on the console
// Display the AT version information
StringFormatter::send(wifiStream, F("AT+GMR\r\n"));
checkForOK(2000, OK_SEARCH, true, false); // Makes this visible on the console
#ifdef DONT_TOUCH_WIFI_CONF
DIAG(F("\nDONT_TOUCH_WIFI_CONF was set: Using existing config\n"));
#else
StringFormatter::send(wifiStream, F("AT+CWMODE=1\r\n")); // configure as "station" = WiFi client
checkForOK(1000, OK_SEARCH, true); // Not always OK, sometimes "no change"
// If the source code looks unconfigured, check if the
// ESP8266 is preconfigured. We check the first 13 chars
// of the SSid.
const char *yourNetwork = "Your network ";
if (strncmp_P(yourNetwork, (const char*)SSid, 13) == 0 || ((const char *)SSid)[0] == '\0') {
delay(8000); // give a preconfigured ES8266 a chance to connect to a router
// typical connect time approx 7 seconds
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n"));
if (checkForOK(5000, (const char*) F("+CIFSR:STAIP"), true,false))
if (!checkForOK(1000, (const char*) F("0.0.0.0"), true,false))
ipOK = true;
} else { // Should this really be "else" here /haba
if (!ipOK) {
// Older ES versions have AT+CWJAP, newer ones have AT+CWJAP_CUR and AT+CWHOSTNAME
StringFormatter::send(wifiStream, F("AT+CWJAP?\r\n"));
if (checkForOK(2000, OK_SEARCH, true)) {
oldCmd=true;
while (wifiStream->available()) StringFormatter::printEscape( wifiStream->read()); /// THIS IS A DIAG IN DISGUISE
// AT command early version supports CWJAP/CWSAP
if (SSid) {
StringFormatter::send(wifiStream, F("AT+CWJAP=\"%S\",\"%S\"\r\n"), SSid, password);
ipOK = checkForOK(WIFI_CONNECT_TIMEOUT, OK_SEARCH, true);
}
DIAG(F("\n**\n"));
} else {
// later version supports CWJAP_CUR
StringFormatter::send(wifiStream, F("AT+CWHOSTNAME=\"%S\"\r\n"), hostname); // Set Host name for Wifi Client
checkForOK(2000, OK_SEARCH, true); // dont care if not supported
if (SSid) {
StringFormatter::send(wifiStream, F("AT+CWJAP_CUR=\"%S\",\"%S\"\r\n"), SSid, password);
ipOK = checkForOK(WIFI_CONNECT_TIMEOUT, OK_SEARCH, true);
}
}
if (ipOK) {
// But we really only have the ESSID and password correct
// Let's check for IP
ipOK = false;
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n"));
if (checkForOK(5000, (const char*) F("+CIFSR:STAIP"), true,false))
if (!checkForOK(1000, (const char*) F("0.0.0.0"), true,false))
ipOK = true;
}
}
}
if (!ipOK) {
// If we have not managed to get this going in station mode, go for AP mode
StringFormatter::send(wifiStream, F("AT+CWMODE=2\r\n")); // configure as AccessPoint.
checkForOK(1000, OK_SEARCH, true); // Not always OK, sometimes "no change"
// Figure out MAC addr
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n"));
// looking fpr mac addr eg +CIFSR:APMAC,"be:dd:c2:5c:6b:b7"
if (checkForOK(5000, (const char*) F("+CIFSR:APMAC,\""), true,false)) {
// Copy 17 byte mac address
for (int i=0; i<17;i++) {
while(!wifiStream->available());
macAddress[i]=wifiStream->read();
StringFormatter::printEscape(macAddress[i]);
}
}
char macTail[]={macAddress[9],macAddress[10],macAddress[12],macAddress[13],macAddress[15],macAddress[16],'\0'};
if (oldCmd) {
while (wifiStream->available()) StringFormatter::printEscape( wifiStream->read()); /// THIS IS A DIAG IN DISGUISE
int i=0;
do {
if (strncmp_P(yourNetwork, (const char*)password, 13) == 0) {
// unconfigured
StringFormatter::send(wifiStream, F("AT+CWSAP=\"DCCEX_%s\",\"PASS_%s\",1,4\r\n"), macTail, macTail);
} else {
// password configured by user
StringFormatter::send(wifiStream, F("AT+CWSAP=\"DCCEX_%s\",\"%s\",1,4\r\n"), macTail, password);
}
} while (i++<2 && !checkForOK(WIFI_CONNECT_TIMEOUT, OK_SEARCH, true)); // do twice if necessary but ignore failure as AP mode may still be ok
} else {
StringFormatter::send(wifiStream, F("AT+CWSAP_CUR=\"DCCEX_%s\",\"PASS_%s\",1,4\r\n"), macTail, macTail);
checkForOK(20000, OK_SEARCH, true); // can ignore failure as SSid mode may still be ok
StringFormatter::send(wifiStream, F("AT+CIPRECVMODE=0\r\n"), port); // make sure transfer mode is correct
checkForOK(2000, OK_SEARCH, true);
}
}
StringFormatter::send(wifiStream, F("AT+CIPSERVER=0\r\n")); // turn off tcp server (to clean connections before CIPMUX=1)
checkForOK(1000, OK_SEARCH, true); // ignore result in case it already was off
StringFormatter::send(wifiStream, F("AT+CIPMUX=1\r\n")); // configure for multiple connections
if (!checkForOK(1000, OK_SEARCH, true)) return WIFI_DISCONNECTED;
StringFormatter::send(wifiStream, F("AT+CIPSERVER=1,%d\r\n"), port); // turn on server on port
if (!checkForOK(1000, OK_SEARCH, true)) return WIFI_DISCONNECTED;
#endif //DONT_TOUCH_WIFI_CONF
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n")); // Display ip addresses to the DIAG
if (!checkForOK(1000, OK_SEARCH, true, false)) return WIFI_DISCONNECTED;
DIAG(F("\nPORT=%d\n"),port);
return WIFI_CONNECTED;
}
#ifdef DONT_TOUCH_WIFI_CONF
#pragma GCC diagnostic pop
#endif
// This function is used to allow users to enter <+ commands> through the DCCEXParser
// Once the user has made whatever changes to the AT commands, a <+X> command can be used
// to force on the connectd flag so that the loop will start picking up wifi traffic.
// If the settings are corrupted <+RST> will clear this and then you must restart the arduino.
void WifiInterface::ATCommand(const byte * command) {
command++;
if (*command=='X') {
connected = true;
DIAG(F("\n++++++ Wifi Connction forced on ++++++++\n"));
}
else {
StringFormatter:: send(wifiStream, F("AT+%s\r\n"), command);
checkForOK(10000, OK_SEARCH, true);
}
}
bool WifiInterface::checkForOK( const unsigned int timeout, const char * waitfor, bool echo, bool escapeEcho) {
unsigned long startTime = millis();
char const *locator = waitfor;
DIAG(F("\nWifi Check: [%E]"), waitfor);
while ( millis() - startTime < timeout) {
while (wifiStream->available()) {
int ch = wifiStream->read();
if (echo) {
if (escapeEcho) StringFormatter::printEscape( ch); /// THIS IS A DIAG IN DISGUISE
else DIAG(F("%c"), ch);
}
if (ch != pgm_read_byte_near(locator)) locator = waitfor;
if (ch == pgm_read_byte_near(locator)) {
locator++;
if (!pgm_read_byte_near(locator)) {
DIAG(F("\nFound in %dms"), millis() - startTime);
return true;
}
}
}
}
DIAG(F("\nTIMEOUT after %dms\n"), timeout);
return false;
}
void WifiInterface::loop() {
if (connected) {
WifiInboundHandler::loop();
}
}
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