source: BAORadio/libindi/v1.0.1/examples/tutorial_rain.c@ 674

#if 0
    Inter-driver communications tutorial - Rain Driver 
    Copyright (C) 2007 Jasem Mutlaq (mutlaqja@ikarustech.com)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <math.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <zlib.h>

#include "indidevapi.h"
#include "eventloop.h"
#include "indicom.h"

#define mydev           "Rain"

#define MAIN_GROUP      "Main"

/* Connect/Disconnect */
static ISwitch PowerS[]                 = {{"CONNECT" , "Connect" , ISS_OFF, 0, 0},{"DISCONNECT", "Disconnect", ISS_ON, 0, 0}};
static ISwitchVectorProperty PowerSP    = { mydev, "CONNECTION" , "Connection", MAIN_GROUP, IP_RW, ISR_1OFMANY, 60, IPS_IDLE, PowerS, NARRAY(PowerS), "", 0};

/* Rain Alert Property. The dome driver will listen to updates on this property. 
   The rain driver does not need to take any action to make this property available to other driver,
   the INDI framework takes care of handling inter-driver communication
*/
static ILight RainL[]                   = {{"Status", "", IPS_IDLE, 0, 0}};
static ILightVectorProperty RainLP      = { mydev, "Rain Alert", "", MAIN_GROUP, IPS_IDLE, RainL , NARRAY(RainL), "", 0};

static ISwitch RainS[]                  = {{"On", "", ISS_OFF, 0, 0}, {"Off", "", ISS_ON, 0, 0}};
static ISwitchVectorProperty RainSP     = { mydev, "Control Rain", "", MAIN_GROUP, IP_RW, ISR_1OFMANY, 0, IPS_IDLE, RainS , NARRAY(RainS), "", 0};

void ISGetProperties (const char *dev)
{ 
  /* MAIN_GROUP */
  IDDefSwitch(&PowerSP, NULL);
  IDDefLight(&RainLP, NULL);
  IDDefSwitch(&RainSP, NULL);
}

void ISNewBLOB (const char *dev, const char *name, int sizes[], int blobsizes[], char *blobs[], char *formats[], char *names[], int n) {}
void ISSnoopDevice (XMLEle *root) {}
  
void ISNewSwitch (const char *dev, const char *name, ISState *states, char *names[], int n)
{
        /* ignore if not ours */
        if (dev && strcmp (dev, mydev))
            return;

        /* Connection */
        if (!strcmp (name, PowerSP.name))
        {
          if (IUUpdateSwitch(&PowerSP, states, names, n) < 0)
                return;

          PowerSP.s = IPS_OK;

          if (PowerS[0].s == ISS_ON)
                IDSetSwitch(&PowerSP, "Rain Collector is online.");
          else
          {
                PowerSP.s = IPS_IDLE;
                IDSetSwitch(&PowerSP, "Rain Collector is offline.");
          }
          return;
        }

        /* rain */
        if (!strcmp (name, RainSP.name))
        {
                if (PowerSP.s != IPS_OK)
                {
                        IDMessage(mydev, "The Rain Collector is offline!");
                        return;
                }
                
          if (IUUpdateSwitch(&RainSP, states, names, n) < 0)
                return;

         RainSP.s = IPS_OK;
         IDSetSwitch(&RainSP, "Rain status updated.");
         
         if (RainS[0].s == ISS_ON)
         {
                 RainL[0].s = IPS_ALERT;
                 RainLP.s   = IPS_ALERT;
                 IDSetLight(&RainLP, "Alert! Alert! Rain detected!");
         }
         else
         {
                 RainL[0].s = IPS_IDLE;
                 RainLP.s   = IPS_OK;
                 IDSetLight(&RainLP, "Rain threat passed. The skies are clear.");
         }
         
           return;
        }
                        
}

void ISNewText (const char *dev, const char *name, char *texts[], char *names[], int n)
{
 
       /* ignore if not ours */ 
       if (dev && strcmp (mydev, dev))
         return;

        /* suppress warning */
        n=n; dev=dev; name=name; names=names; texts=texts;
        
}


void ISNewNumber (const char *dev, const char *name, double values[], char *names[], int n)
{
       
}