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/* $Id: dgnss.c 3771 2006-11-02 05:15:20Z esr $ */
/* dgnss.c -- common interface to a number of Differential GNSS services */
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "gpsd_config.h"
#include "gpsd.h"
#define DGNSS_PROTO_DGPSIP "dgpsip://"
#define DGNSS_PROTO_NTRIP "ntrip://"
/* Where to find the list of DGPSIP correction servers, if there is one */
#define DGPSIP_SERVER_LIST "/usr/share/gpsd/dgpsip-servers"
bool dgnss_url(char *name)
/* is given string a valid URL for DGPS service? */
{
return
strncmp(name,DGNSS_PROTO_NTRIP,strlen(DGNSS_PROTO_NTRIP))==0
|| strncmp(name,DGNSS_PROTO_DGPSIP,strlen(DGNSS_PROTO_DGPSIP))==0;
}
/*@ -branchstate */
int dgnss_open(struct gps_context_t *context, char *dgnss_service)
/* open a connection to a DGNSS service */
{
#ifdef NTRIP_ENABLE
if (strncmp(dgnss_service,DGNSS_PROTO_NTRIP,strlen(DGNSS_PROTO_NTRIP))==0)
return ntrip_open(context, dgnss_service + strlen(DGNSS_PROTO_NTRIP));
#endif
if (strncmp(dgnss_service,DGNSS_PROTO_DGPSIP,strlen(DGNSS_PROTO_DGPSIP))==0)
return dgpsip_open(context, dgnss_service + strlen(DGNSS_PROTO_DGPSIP));
#ifndef REQUIRE_DGNSS_PROTO
return dgpsip_open(context, dgnss_service);
#else
gpsd_report(LOG_ERROR, "Unknown or unspecified DGNSS protocol for service %s\n",
dgnss_service);
return -1;
#endif
}
/*@ +branchstate */
int dgnss_poll(struct gps_context_t *context)
/* poll the DGNSS service for a correction report */
{
if (context->dsock > -1) {
context->rtcmbytes = read(context->dsock, context->rtcmbuf, sizeof(context->rtcmbuf));
if ((context->rtcmbytes == -1 && errno != EAGAIN) ||
(context->rtcmbytes == 0)) {
(void)shutdown(context->dsock, SHUT_RDWR);
(void)close(context->dsock);
return -1;
} else
context->rtcmtime = timestamp();
}
return 0;
}
void dgnss_report(struct gps_device_t *session)
/* may be time to ship a usage report to the DGNSS service */
{
if (session->context->dgnss_service == dgnss_dgpsip)
dgpsip_report(session);
#ifdef NTRIP_ENABLE
else if (session->context->dgnss_service == dgnss_ntrip)
ntrip_report(session);
#endif
}
void dgnss_autoconnect(struct gps_context_t *context, double lat, double lon)
{
if (context->dgnss_service != dgnss_ntrip) {
dgpsip_autoconnect(context, lat, lon, DGPSIP_SERVER_LIST);
}
}
void rtcm_relay(struct gps_device_t *session)
/* pass a DGNSS connection report to a session */
{
if (session->gpsdata.gps_fd !=-1
&& session->context->rtcmbytes > -1
&& session->rtcmtime < session->context->rtcmtime
&& session->device_type->rtcm_writer != NULL) {
if (session->device_type->rtcm_writer(session,
session->context->rtcmbuf,
(size_t)session->context->rtcmbytes) == 0)
gpsd_report(LOG_ERROR, "Write to rtcm sink failed\n");
else {
session->rtcmtime = timestamp();
gpsd_report(LOG_IO, "<= DGPS: %d bytes of RTCM relayed.\n", session->context->rtcmbytes);
}
}
}
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