#79: add udp writer

lib/api/GwApi.h

@@ -95,6 +95,7 @@ class GwApi{
                 unsigned long ser2Tx=0;
                 unsigned long tcpSerRx=0;
                 unsigned long tcpSerTx=0;
+                unsigned long udpwTx=0;
                 int tcpClients=0;
                 unsigned long tcpClRx=0;
                 unsigned long tcpClTx=0;

lib/channel/GwChannelList.cpp

@@ -6,6 +6,7 @@
 #include "GwSocketServer.h"
 #include "GwSerial.h"
 #include "GwTcpClient.h"
+#include "GwUdpWriter.h"
 class SerInit{
     public:
         int serial=-1;
@@ -241,6 +242,24 @@ static  ChannelParam channelParameters[]={
         .maxId=-1,
         .rxstatus=offsetof(GwApi::Status,GwApi::Status::tcpClRx),
         .txstatus=offsetof(GwApi::Status,GwApi::Status::tcpClTx)
+    },
+    {
+        .id=UDPW_CHANNEL_ID,
+        .baud="",
+        .receive="",
+        .send=GwConfigDefinitions::udpwEnabled,
+        .direction="",
+        .toN2K="",
+        .readF="",
+        .writeF=GwConfigDefinitions::udpwWriteFilter,
+        .preventLog="",
+        .readAct="",
+        .writeAct="",
+        .sendSeasmart=GwConfigDefinitions::udpwSeasmart,
+        .name="UDPWriter",
+        .maxId=-1,
+        .rxstatus=0,
+        .txstatus=offsetof(GwApi::Status,GwApi::Status::udpwTx)
     }
 
 };
@@ -425,6 +444,13 @@ void GwChannelList::begin(bool fallbackSerial){
         );
     }
     addChannel(createChannel(logger,config,TCP_CLIENT_CHANNEL_ID,client));
+
+    //udp writer
+    if (config->getBool(GwConfigDefinitions::udpwEnabled)){
+        GwUdpWriter *writer=new GwUdpWriter(config,logger,UDPW_CHANNEL_ID);
+        writer->begin();
+        addChannel(createChannel(logger,config,UDPW_CHANNEL_ID,writer));
+    }
     logger->flush();
 }
 String GwChannelList::getMode(int id){

lib/channel/GwChannelList.h

@@ -18,6 +18,7 @@
 #define SERIAL2_CHANNEL_ID 3
 #define TCP_CLIENT_CHANNEL_ID 4
 #define MIN_TCP_CHANNEL_ID 5
+#define UDPW_CHANNEL_ID 20
 
 #define MIN_USER_TASK 200
 class GwSocketServer;

lib/socketserver/GwUdpWriter.cpp

@@ -0,0 +1,59 @@
+#include "GwUdpWriter.h"
+#include <ESPmDNS.h>
+#include <errno.h>
+#include "GwBuffer.h"
+#include "GwSocketConnection.h"
+#include "GwSocketHelper.h"
+
+GwUdpWriter::GwUdpWriter(const GwConfigHandler *config, GwLog *logger, int minId)
+{
+    this->config = config;
+    this->logger = logger;
+    this->minId = minId;
+}
+
+void GwUdpWriter::begin()
+{
+    fd=socket(AF_INET,SOCK_DGRAM,IPPROTO_IP);
+    if (fd < 0){
+        LOG_ERROR("unable to create udp socket");
+        return;
+    }
+    int enable = 1;
+    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int));
+    setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &enable, sizeof(int));
+    port=config->getInt(GwConfigDefinitions::udpwPort);
+    //TODO: check port
+    address=config->getString(GwConfigDefinitions::udpwAddress);
+    LOG_INFO("UDP writer created, address=%s, port=%d",
+            address.c_str(),port);
+    inet_pton(AF_INET, address.c_str(), &destination.sin_addr);
+    destination.sin_family = AF_INET;
+    destination.sin_port = htons(port);
+}
+
+void GwUdpWriter::loop(bool handleRead, bool handleWrite)
+{
+    
+}
+
+void GwUdpWriter::readMessages(GwMessageFetcher *writer)
+{
+    
+}
+size_t GwUdpWriter::sendToClients(const char *buf, int source,bool partial)
+{ 
+    if (source == minId) return 0;
+    size_t len=strlen(buf);
+    ssize_t err = sendto(fd,buf,len,0,(struct sockaddr *)&destination, sizeof(destination));
+    if (err < 0){
+        LOG_DEBUG(GwLog::DEBUG,"UDP writer error sending: %d",errno);
+        return 0;
+    }
+    return err;
+}
+
+
+GwUdpWriter::~GwUdpWriter()
+{
+}

lib/socketserver/GwUdpWriter.h

@@ -0,0 +1,28 @@
+#ifndef _GWUDPWRITER_H
+#define _GWUDPWRITER_H
+#include "GWConfig.h"
+#include "GwLog.h"
+#include "GwBuffer.h"
+#include "GwChannelInterface.h"
+#include <memory>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+class GwUdpWriter: public GwChannelInterface{
+    private:
+        const GwConfigHandler *config;
+        GwLog *logger;
+        int fd=-1;
+        int minId;
+        int port;
+        String address;
+        struct sockaddr_in destination;
+    public:
+        GwUdpWriter(const GwConfigHandler *config,GwLog *logger,int minId);
+        ~GwUdpWriter();
+        void begin();
+        virtual void loop(bool handleRead=true,bool handleWrite=true);
+        virtual size_t sendToClients(const char *buf,int sourceId, bool partialWrite=false);
+        virtual void readMessages(GwMessageFetcher *writer);
+};
+#endif