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CommandStation-EX/WifiInterface.cpp

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/*
© 2020, Chris Harlow. All rights reserved.
This file is part of Asbelos DCC API
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 <avr/pgmspace.h>
#include "WifiInterface.h"
#include "DIAG.h"
#include "StringFormatter.h"
#include "WiThrottle.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 PROMPT_SEARCH[] = ">";
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;
bool WifiInterface::closeAfter = false;
DCCEXParser WifiInterface::parser;
byte WifiInterface::loopstate = 0;
unsigned long WifiInterface::loopTimeoutStart = 0;
int WifiInterface::datalength = 0;
int WifiInterface::connectionId;
byte WifiInterface::buffer[MAX_WIFI_BUFFER+1];
MemStream WifiInterface::streamer(buffer, MAX_WIFI_BUFFER);
Stream * WifiInterface::wifiStream = NULL;
HTTP_CALLBACK WifiInterface::httpCallback = 0;
bool WifiInterface::setup(Stream & setupStream, const __FlashStringHelper* SSid, const __FlashStringHelper* password,
const __FlashStringHelper* hostname, int port) {
static uint8_t ntry = 0;
ntry++;
wifiStream = &setupStream;
DIAG(F("\n++ Wifi Setup Try %d ++\n"), ntry);
connected = setup2( SSid, password, hostname, port);
if (connected) {
StringFormatter::send(wifiStream, F("ATE0\r\n")); // turn off the echo
checkForOK(200, OK_SEARCH, true);
}
DIAG(F("\n++ Wifi Setup %S ++\n"), connected ? F("OK") : F("FAILED"));
return connected;
}
bool WifiInterface::setup2(const __FlashStringHelper* SSid, const __FlashStringHelper* password,
const __FlashStringHelper* 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
return true;
}
StringFormatter::send(wifiStream, F("AT\r\n")); // Is something here that understands AT?
if(!checkForOK(200, OK_SEARCH, true))
return false; // 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
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 password.
if (strncmp_P("Your network ",(const char*)password,13) == 0) {
delay(8000); // give a preconfigured ES8266 a chance to connect to a router
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 {
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(16000, 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(20000, OK_SEARCH, true);
}
}
delay(8000); // give a preconfigured ES8266 a chance to connect to a router
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
StringFormatter::send(wifiStream, F("AT+CWSAP=\"DCCEX_%s\",\"PASS_%s\",1,4\r\n"), macTail, macTail);
checkForOK(16000, OK_SEARCH, true); // can 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+CIPMUX=1\r\n")); // configure for multiple connections
if (!checkForOK(10000, OK_SEARCH, true)) return false;
StringFormatter::send(wifiStream, F("AT+CIPSERVER=1,%d\r\n"), port); // turn on server on port
if (!checkForOK(10000, OK_SEARCH, true)) return false;
StringFormatter::send(wifiStream, F("AT+CIFSR\r\n")); // Display ip addresses to the DIAG
if (!checkForOK(10000, OK_SEARCH, true, false)) return false;
DIAG(F("\nPORT=%d\n"),port);
return true;
}
// 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);
}
}
void WifiInterface::setHTTPCallback(HTTP_CALLBACK callback) {
httpCallback = callback;
}
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;
}
bool WifiInterface::isHTTP() {
// POST GET PUT PATCH DELETE
// You may think a simple strstr() is better... but not when ram & time is in short supply
switch (buffer[0]) {
case 'P':
if (buffer[1] == 'U' && buffer[2] == 'T' && buffer[3] == ' ' ) return true;
if (buffer[1] == 'O' && buffer[2] == 'S' && buffer[3] == 'T' && buffer[4] == ' ') return true;
if (buffer[1] == 'A' && buffer[2] == 'T' && buffer[3] == 'C' && buffer[4] == 'H' && buffer[5] == ' ') return true;
return false;
case 'G':
if (buffer[1] == 'E' && buffer[2] == 'T' && buffer[3] == ' ' ) return true;
return false;
case 'D':
if (buffer[1] == 'E' && buffer[2] == 'L' && buffer[3] == 'E' && buffer[4] == 'T' && buffer[5] == 'E' && buffer[6] == ' ') return true;
return false;
default:
return false;
}
}
void WifiInterface::loop() {
if (!connected) return;
WiThrottle::loop(); // check heartbeats
// read anything into a buffer, collecting info on the way
while (loopstate != 99 && wifiStream->available()) {
int ch = wifiStream->read();
// echo the char to the diagnostic stream in escaped format
if (Diag::WIFI) StringFormatter::printEscape(ch); // DIAG in disguise
switch (loopstate) {
case 0: // looking for +IPD
connectionId = 0;
if (ch == '+') loopstate = 1;
break;
case 1: // Looking for I in +IPD
loopstate = (ch == 'I') ? 2 : 0;
break;
case 2: // Looking for P in +IPD
loopstate = (ch == 'P') ? 3 : 0;
break;
case 3: // Looking for D in +IPD
loopstate = (ch == 'D') ? 4 : 0;
break;
case 4: // Looking for , After +IPD
loopstate = (ch == ',') ? 5 : 0;
break;
case 5: // reading connection id
if (ch == ',') loopstate = 6;
else connectionId = 10 * connectionId + (ch - '0');
break;
case 6: // reading for length
if (ch == ':') loopstate = (datalength == 0) ? 99 : 7; // 99 is getout without reading next char
else datalength = datalength * 10 + (ch - '0');
streamer.flush(); // basically sets write point at start of buffer
break;
case 7: // reading data
streamer.write(ch); // NOTE: The MemStream will throw away bytes that do not fit in the buffer.
// This protects against buffer overflows even with things as innocent
// as a browser which send massive, irrlevent HTTP headers.
datalength--;
if (datalength == 0) {
buffer[streamer.available()]='\0'; // mark end of buffer, so it can be used as a string later
loopstate = 99;
}
break;
case 10: // Waiting for > so we can send reply
if (millis() - loopTimeoutStart > LOOP_TIMEOUT) {
if (Diag::WIFI) DIAG(F("\nWifi TIMEOUT on wait for > prompt or ERROR\n"));
loopstate = 0; // go back to +IPD
break;
}
if (ch == '>') {
// DIAG(F("\n> [%e]\n"),buffer);
wifiStream->print((char *) buffer);
loopTimeoutStart = millis();
loopstate = closeAfter ? 11 : 0;
break;
}
if (ch == '.') { // busy during send, delay and retry
loopstate = 12; // look for SEND OK finished
break;
}
break;
case 11: // Waiting for SEND OK or ERROR to complete so we can closeAfter
if (millis() - loopTimeoutStart > LOOP_TIMEOUT) {
if (Diag::WIFI) DIAG(F("\nWifi TIMEOUT on wait for SEND OK or ERROR\n"));
loopstate = 0; // go back to +IPD
break;
}
if (ch == 'K') { // assume its in SEND OK
if (Diag::WIFI) DIAG(F("\n Wifi AT+CIPCLOSE=%d\r\n"), connectionId);
StringFormatter::send(wifiStream, F("AT+CIPCLOSE=%d\r\n"), connectionId);
loopstate = 0; // wait for +IPD
}
break;
case 12: // Waiting for OK after send busy
if (ch == '+') { // Uh-oh IPD problem
if (Diag::WIFI) DIAG(F("\n\n Wifi ASYNC CLASH - LOST REPLY\n"));
connectionId = 0;
loopstate = 1;
}
if (ch == 'K') { // assume its in SEND OK
if (Diag::WIFI) DIAG(F("\n\n Wifi BUSY RETRYING.. AT+CIPSEND=%d,%d\r\n"), connectionId, streamer.available());
StringFormatter::send(wifiStream, F("AT+CIPSEND=%d,%d\r\n"), connectionId, streamer.available());
loopTimeoutStart = millis();
loopstate = 10; // non-blocking loop waits for > before sending
break;
}
break;
} // switch
} // while
if (loopstate != 99) return;
// AT this point we have read an incoming message into the buffer
if (Diag::WIFI) DIAG(F("\n%l Wifi(%d)<-[%e]\n"), millis(),connectionId, buffer);
streamer.setBufferContentPosition(0, 0); // reset write position to start of buffer
// SIDE EFFECT WARNING:::
// We know that parser will read the entire buffer before starting to write to it.
// Otherwise we would have to copy the buffer elsewhere and RAM is in short supply.
closeAfter = false;
// Intercept HTTP requests
if (isHTTP()) {
if (httpCallback) httpCallback(&streamer, buffer);
else {
StringFormatter::send(streamer, F("HTTP/1.1 404 Not Found\nContent-Type: text/html\nConnnection: close\n\n"));
StringFormatter::send(streamer, F("<html><body>This is <b>not</b> a web server.<br/></body></html>"));
}
closeAfter = true;
}
else if (buffer[0] == '<') parser.parse(&streamer, buffer, true); // tell JMRI parser that ACKS are blocking because we can't handle the async
else WiThrottle::getThrottle(connectionId)->parse(streamer, buffer);
if (streamer.available() == 0) {
// No reply
if (closeAfter) {
if (Diag::WIFI) DIAG(F("AT+CIPCLOSE=%d\r\n"), connectionId);
StringFormatter::send(wifiStream, F("AT+CIPCLOSE=%d\r\n"), connectionId);
}
loopstate = 0; // go back to waiting for +IPD
return;
}
// prepare to send reply
buffer[streamer.available()]='\0'; // mark end of buffer, so it can be used as a string later
if (Diag::WIFI) DIAG(F("%l WiFi(%d)->[%e] l(%d)\n"), millis(), connectionId, buffer, streamer.available());
if (Diag::WIFI) DIAG(F("AT+CIPSEND=%d,%d\r\n"), connectionId, streamer.available());
StringFormatter::send(wifiStream, F("AT+CIPSEND=%d,%d\r\n"), connectionId, streamer.available());
loopTimeoutStart = millis();
loopstate = 10; // non-blocking loop waits for > before sending
}
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