mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-23 08:06:13 +01:00
257 lines
8.0 KiB
C++
257 lines
8.0 KiB
C++
/*
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* © 2020, Chris Harlow. All rights reserved.
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* © 2020, Harald Barth.
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*
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* This file is part of Asbelos DCC API
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef ARDUINO_AVR_UNO_WIFI_REV2
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#include <Arduino.h>
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#include "WifiInboundHandler.h"
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#include "RingStream.h"
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#include "CommandDistributor.h"
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#include "DIAG.h"
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WifiInboundHandler * WifiInboundHandler::singleton;
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void WifiInboundHandler::setup(Stream * ESStream) {
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singleton=new WifiInboundHandler(ESStream);
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}
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void WifiInboundHandler::loop() {
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singleton->loop1();
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}
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WifiInboundHandler::WifiInboundHandler(Stream * ESStream) {
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wifiStream=ESStream;
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clientPendingCIPSEND=-1;
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inboundRing=new RingStream(INBOUND_RING);
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outboundRing=new RingStream(OUTBOUND_RING);
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pendingCipsend=false;
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}
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// Handle any inbound transmission
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// +IPD,x,lll:data is stored in streamer[x]
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// Other input returns
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void WifiInboundHandler::loop1() {
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// First handle all inbound traffic events because they will block the sending
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if (loop2()!=INBOUND_IDLE) return;
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WiThrottle::loop(outboundRing);
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// if nothing is already CIPSEND pending, we can CIPSEND one reply
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if (clientPendingCIPSEND<0) {
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clientPendingCIPSEND=outboundRing->read();
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if (clientPendingCIPSEND>=0) {
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currentReplySize=outboundRing->count();
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pendingCipsend=true;
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}
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}
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if (pendingCipsend) {
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if (Diag::WIFI) DIAG( F("WiFi: [[CIPSEND=%d,%d]]"), clientPendingCIPSEND, currentReplySize);
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StringFormatter::send(wifiStream, F("AT+CIPSEND=%d,%d\r\n"), clientPendingCIPSEND, currentReplySize);
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pendingCipsend=false;
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return;
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}
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// if something waiting to execute, we can call it
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int clientId=inboundRing->read();
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if (clientId>=0) {
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int count=inboundRing->count();
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if (Diag::WIFI) DIAG(F("Wifi EXEC: %d %d:"),clientId,count);
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byte cmd[count+1];
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for (int i=0;i<count;i++) cmd[i]=inboundRing->read();
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cmd[count]=0;
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if (Diag::WIFI) DIAG(F("%e"),cmd);
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outboundRing->mark(clientId); // remember start of outbound data
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CommandDistributor::parse(clientId,cmd,outboundRing);
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// The commit call will either write the lenbgth bytes
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// OR rollback to the mark because the reply is empty or commend generated more than fits the buffer
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if (!outboundRing->commit()) {
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DIAG(F("OUTBOUND FULL processing cmd:%s"),cmd);
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}
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return;
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}
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}
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// This is a Finite State Automation (FSA) handling the inbound bytes from an ES AT command processor
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WifiInboundHandler::INBOUND_STATE WifiInboundHandler::loop2() {
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while (wifiStream->available()) {
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int ch = wifiStream->read();
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// echo the char to the diagnostic stream in escaped format
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if (Diag::WIFI) {
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// DIAG(F(" %d/"), loopState);
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StringFormatter::printEscape(ch); // DIAG in disguise
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}
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switch (loopState) {
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case ANYTHING: // looking for +IPD, > , busy , n,CONNECTED, n,CLOSED, ERROR, SEND OK
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if (ch == '+') {
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loopState = IPD;
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break;
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}
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if (ch=='>') {
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if (Diag::WIFI) DIAG(F("[XMIT %d]"),currentReplySize);
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for (int i=0;i<currentReplySize;i++) {
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int cout=outboundRing->read();
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wifiStream->write(cout);
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if (Diag::WIFI) StringFormatter::printEscape(cout); // DIAG in disguise
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}
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clientPendingCIPSEND=-1;
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pendingCipsend=false;
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loopState=SKIPTOEND;
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break;
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}
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if (ch=='R') { // Received ... bytes
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loopState=SKIPTOEND;
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break;
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}
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if (ch=='S') { // SEND OK probably
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loopState=SKIPTOEND;
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break;
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}
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if (ch=='b') { // This is a busy indicator... probabaly must restart a CIPSEND
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pendingCipsend=(clientPendingCIPSEND>=0);
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loopState=SKIPTOEND;
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break;
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}
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if (ch>='0' && ch<='9') {
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runningClientId=ch-'0';
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loopState=GOT_CLIENT_ID;
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break;
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}
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if (ch=='E' || ch=='l') { // ERROR or "link is not valid"
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if (clientPendingCIPSEND>=0) {
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// A CIPSEND was errored... just toss it away
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purgeCurrentCIPSEND();
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}
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loopState=SKIPTOEND;
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break;
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}
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break;
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case IPD: // Looking for I in +IPD
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loopState = (ch == 'I') ? IPD1 : SKIPTOEND;
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break;
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case IPD1: // Looking for P in +IPD
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loopState = (ch == 'P') ? IPD2 : SKIPTOEND;
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break;
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case IPD2: // Looking for D in +IPD
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loopState = (ch == 'D') ? IPD3 : SKIPTOEND;
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break;
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case IPD3: // Looking for , After +IPD
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loopState = (ch == ',') ? IPD4_CLIENT : SKIPTOEND;
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break;
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case IPD4_CLIENT: // reading connection id
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if (ch >= '0' || ch <='9'){
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runningClientId=ch-'0';
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loopState=IPD5;
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}
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else loopState=SKIPTOEND;
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break;
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case IPD5: // Looking for , After +IPD,client
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loopState = (ch == ',') ? IPD6_LENGTH : SKIPTOEND;
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dataLength=0; // ready to start collecting the length
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break;
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case IPD6_LENGTH: // reading for length
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if (ch == ':') {
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if (dataLength==0) {
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loopState=ANYTHING;
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break;
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}
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if (Diag::WIFI) DIAG(F("Wifi inbound data(%d:%d):"),runningClientId,dataLength);
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if (inboundRing->freeSpace()<=(dataLength+1)) {
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// This input would overflow the inbound ring, ignore it
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loopState=IPD_IGNORE_DATA;
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if (Diag::WIFI) DIAG(F("Wifi OVERFLOW IGNORING:"));
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break;
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}
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inboundRing->mark(runningClientId);
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loopState=IPD_DATA;
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break;
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}
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dataLength = dataLength * 10 + (ch - '0');
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break;
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case IPD_DATA: // reading data
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inboundRing->write(ch);
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dataLength--;
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if (dataLength == 0) {
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inboundRing->commit();
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loopState = ANYTHING;
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}
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break;
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case IPD_IGNORE_DATA: // ignoring data that would not fit in inbound ring
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dataLength--;
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if (dataLength == 0) loopState = ANYTHING;
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break;
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case GOT_CLIENT_ID: // got x before CLOSE or CONNECTED
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loopState=(ch==',') ? GOT_CLIENT_ID2: SKIPTOEND;
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break;
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case GOT_CLIENT_ID2: // got "x,"
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if (ch=='C') {
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// got "x C" before CLOSE or CONNECTED, or CONNECT FAILED
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if (runningClientId==clientPendingCIPSEND) purgeCurrentCIPSEND();
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else CommandDistributor::forget(runningClientId);
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}
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loopState=SKIPTOEND;
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break;
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case SKIPTOEND: // skipping for /n
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if (ch=='\n') loopState=ANYTHING;
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break;
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} // switch
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} // available
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return (loopState==ANYTHING) ? INBOUND_IDLE: INBOUND_BUSY;
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}
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void WifiInboundHandler::purgeCurrentCIPSEND() {
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// A CIPSEND was sent but errored... or the client closed just toss it away
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CommandDistributor::forget(clientPendingCIPSEND);
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DIAG(F("Wifi: DROPPING CIPSEND=%d,%d"),clientPendingCIPSEND,currentReplySize);
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for (int i=0;i<=currentReplySize;i++) outboundRing->read();
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pendingCipsend=false;
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clientPendingCIPSEND=-1;
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}
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#endif
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