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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/>.
*/
#ifndef ARDUINO_AVR_UNO_WIFI_REV2
// This code is NOT compiled on a unoWifiRev2 processor which uses a different architecture
#include "WifiInterface.h" /* config.h included there */
#include <avr/pgmspace.h>
#include "DIAG.h"
#include "StringFormatter.h"
#include "WifiInboundHandler.h"
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.
// The ES should fail a connect in 15 seconds, we don't want to fail BEFORE that
// or ot will cause issues with the following commands.
#define WIFI_CONNECT_TIMEOUT 16000
#endif
////////////////////////////////////////////////////////////////////////////////
//
// Figure out number of serial ports depending on hardware
//
#if defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_NANO)
#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,
const byte channel) {
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;
(void) channel;
#endif
#if NUM_SERIAL > 0 && !defined(SERIAL1_COMMANDS)
Serial1.begin(serial_link_speed);
wifiUp = setup(Serial1, wifiESSID, wifiPassword, hostname, port, channel);
#endif
// Other serials are tried, depending on hardware.
#if NUM_SERIAL > 1 && !defined(SERIAL2_COMMANDS)
if (wifiUp == WIFI_NOAT)
{
Serial2.begin(serial_link_speed);
wifiUp = setup(Serial2, wifiESSID, wifiPassword, hostname, port, channel);
}
#endif
#if NUM_SERIAL > 2 && !defined(SERIAL3_COMMANDS)
if (wifiUp == WIFI_NOAT)
{
Serial3.begin(serial_link_speed);
wifiUp = setup(Serial3, wifiESSID, wifiPassword, hostname, port, channel);
}
#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, byte channel) {
wifiSerialState wifiState;
static uint8_t ntry = 0;
ntry++;
wifiStream = &setupStream;
DIAG(F("++ Wifi Setup Try %d ++"), ntry);
wifiState = setup2( SSid, password, hostname, port, channel);
if (wifiState == WIFI_NOAT) {
DIAG(F("++ Wifi Setup NO AT ++"));
return wifiState;
}
if (wifiState == WIFI_CONNECTED) {
StringFormatter::send(wifiStream, F("ATE0\r\n")); // turn off the echo
checkForOK(200, true);
}
DIAG(F("++ Wifi Setup %S ++"), 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, byte channel) {
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,F("+IPD"), true)) {
DIAG(F("Preconfigured Wifi already running with data waiting"));
return WIFI_CONNECTED;
}
StringFormatter::send(wifiStream, F("AT\r\n")); // Is something here that understands AT?
if(!checkForOK(200, 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, true); // Makes this visible on the console
// Display the AT version information
StringFormatter::send(wifiStream, F("AT+GMR\r\n"));
checkForOK(2000, true, false); // Makes this visible on the console
#ifdef DONT_TOUCH_WIFI_CONF
DIAG(F("DONT_TOUCH_WIFI_CONF was set: Using existing config"));
#else
// Older ES versions have AT+CWJAP, newer ones have AT+CWJAP_CUR and AT+CWHOSTNAME
StringFormatter::send(wifiStream, F("AT+CWJAP_CUR?\r\n"));
if (!(checkForOK(2000, true))) {
oldCmd=true;
while (wifiStream->available()) StringFormatter::printEscape( wifiStream->read()); /// THIS IS A DIAG IN DISGUISE
}
StringFormatter::send(wifiStream, F("AT+CWMODE%s=1\r\n"), oldCmd ? "" : "_CUR"); // configure as "station" = WiFi client
checkForOK(1000, true); // Not always OK, sometimes "no change"
const char *yourNetwork = "Your network ";
if (strncmp_P(yourNetwork, (const char*)SSid, 13) == 0 || strncmp_P("", (const char*)SSid, 13) == 0) {
if (strncmp_P(yourNetwork, (const char*)password, 13) == 0) {
// If the source code looks unconfigured, check if the
// ESP8266 is preconfigured in station mode.
// We check the first 13 chars of the SSid and the password
// give a preconfigured ES8266 a chance to connect to a router
// typical connect time approx 7 seconds
delay(8000);
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n"));
if (checkForOK(5000, F("+CIFSR:STAIP"), true,false))
if (!checkForOK(1000, F("0.0.0.0"), true,false))
ipOK = true;
}
} else {
// SSID was configured, so we assume station (client) mode.
if (oldCmd) {
// AT command early version supports CWJAP/CWSAP
StringFormatter::send(wifiStream, F("AT+CWJAP=\"%S\",\"%S\"\r\n"), SSid, password);
ipOK = checkForOK(WIFI_CONNECT_TIMEOUT, true);
} else {
// later version supports CWJAP_CUR
StringFormatter::send(wifiStream, F("AT+CWHOSTNAME=\"%S\"\r\n"), hostname); // Set Host name for Wifi Client
checkForOK(2000, true); // dont care if not supported
StringFormatter::send(wifiStream, F("AT+CWJAP_CUR=\"%S\",\"%S\"\r\n"), SSid, password);
ipOK = checkForOK(WIFI_CONNECT_TIMEOUT, true);
}
if (ipOK) {
// But we really only have the ESSID and password correct
// Let's check for IP (via DHCP)
ipOK = false;
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n"));
if (checkForOK(5000, F("+CIFSR:STAIP"), true,false))
if (!checkForOK(1000, 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+RST\r\n"));
// checkForOK(1000, true); // Not always OK, sometimes "no change"
int i=0;
do {
// configure as AccessPoint. Try really hard as this is the
// last way out to get any Wifi connectivity.
StringFormatter::send(wifiStream, F("AT+CWMODE%s=2\r\n"), oldCmd ? "" : "_CUR");
} while (!checkForOK(1000+i*500, true) && i++<10);
while (wifiStream->available()) StringFormatter::printEscape( wifiStream->read()); /// THIS IS A DIAG IN DISGUISE
// Figure out MAC addr
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n")); // not TOMATO
// looking fpr mac addr eg +CIFSR:APMAC,"be:dd:c2:5c:6b:b7"
if (checkForOK(5000, 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]);
}
} else {
memset(macAddress,'f',sizeof(macAddress));
}
char macTail[]={macAddress[9],macAddress[10],macAddress[12],macAddress[13],macAddress[15],macAddress[16],'\0'};
checkForOK(1000, true, false); // suck up remainder of AT+CIFSR
i=0;
do {
if (strncmp_P(yourNetwork, (const char*)password, 13) == 0) {
// unconfigured
StringFormatter::send(wifiStream, F("AT+CWSAP%s=\"DCCEX_%s\",\"PASS_%s\",%d,4\r\n"),
oldCmd ? "" : "_CUR", macTail, macTail, channel);
} else {
// password configured by user
StringFormatter::send(wifiStream, F("AT+CWSAP%s=\"DCCEX_%s\",\"%S\",%d,4\r\n"), oldCmd ? "" : "_CUR",
macTail, password, channel);
}
} while (!checkForOK(WIFI_CONNECT_TIMEOUT, true) && i++<2); // do twice if necessary but ignore failure as AP mode may still be ok
if (i >= 2)
DIAG(F("Warning: Setting AP SSID and password failed")); // but issue warning
if (!oldCmd) {
StringFormatter::send(wifiStream, F("AT+CIPRECVMODE=0\r\n"), port); // make sure transfer mode is correct
checkForOK(2000, true);
}
}
StringFormatter::send(wifiStream, F("AT+CIPSERVER=0\r\n")); // turn off tcp server (to clean connections before CIPMUX=1)
checkForOK(1000, 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, true)) return WIFI_DISCONNECTED;
if(!oldCmd) { // no idea to test this on old firmware
StringFormatter::send(wifiStream, F("AT+MDNS=1,\"%S\",\"withrottle\",%d\r\n"),
hostname, port); // mDNS responder
checkForOK(1000, true); // dont care if not supported
}
StringFormatter::send(wifiStream, F("AT+CIPSERVER=1,%d\r\n"), port); // turn on server on port
if (!checkForOK(1000, 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, F("IP,\"") , true, false)) return WIFI_DISCONNECTED;
// Copy the IP address
{
const byte MAX_IP_LENGTH=15;
char ipString[MAX_IP_LENGTH+1];
ipString[MAX_IP_LENGTH]='\0'; // protection against missing " character on end.
for(byte ipLen=0;ipLen<MAX_IP_LENGTH;ipLen++) {
while(!wifiStream->available());
int ipChar=wifiStream->read();
StringFormatter::printEscape(ipChar);
if (ipChar=='"') {
ipString[ipLen]='\0';
break;
}
ipString[ipLen]=ipChar;
}
LCD(4,F("%s"),ipString); // There is not enough room on some LCDs to put a title to this
}
// suck up anything after the IP.
if (!checkForOK(1000, true, false)) return WIFI_DISCONNECTED;
LCD(5,F("PORT=%d"),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
// <+command> sends AT+command to the ES and returns to the caller.
// 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.
// Using the <+> command with no command string causes the code to enter an echo loop so that all
// input is directed to the ES and all ES output written to the USB Serial.
// The sequence "!!!" returns the Arduino to the normal loop mode
void WifiInterface::ATCommand(HardwareSerial * stream,const byte * command) {
command++;
if (*command=='\0') { // User gave <+> command
stream->print(F("\nES AT command passthrough mode, use ! to exit\n"));
while(stream->available()) stream->read(); // Drain serial input first
bool startOfLine=true;
while(true) {
while (wifiStream->available()) stream->write(wifiStream->read());
if (stream->available()) {
int cx=stream->read();
// A newline followed by !!! is an exit
if (cx=='\n' || cx=='\r') startOfLine=true;
else if (startOfLine && cx=='!') break;
else startOfLine=false;
stream->write(cx);
wifiStream->write(cx);
}
}
stream->print(F("Passthrough Ended"));
return;
}
if (*command=='X') {
connected = true;
DIAG(F("++++++ Wifi Connction forced on ++++++++"));
}
else {
StringFormatter:: send(wifiStream, F("AT+%s\r\n"), command);
checkForOK(10000, true);
}
}
bool WifiInterface::checkForOK( const unsigned int timeout, bool echo, bool escapeEcho) {
return checkForOK(timeout,F("\r\nOK\r\n"),echo,escapeEcho);
}
bool WifiInterface::checkForOK( const unsigned int timeout, const FSH * waitfor, bool echo, bool escapeEcho) {
unsigned long startTime = millis();
char *locator = (char *)waitfor;
DIAG(F("Wifi 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 StringFormatter::diagSerial->print((char)ch);
}
if (ch != GETFLASH(locator)) locator = (char *)waitfor;
if (ch == GETFLASH(locator)) {
locator++;
if (!GETFLASH(locator)) {
DIAG(F("Found in %dms"), millis() - startTime);
return true;
}
}
}
}
DIAG(F("TIMEOUT after %dms"), timeout);
return false;
}
void WifiInterface::loop() {
if (connected) {
WifiInboundHandler::loop();
}
}
#endif
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