This script allows to use an Ericsson F5521gw mobile broadband module (aka Dell DW5500 or Hewlett-Packard HS2340) with gpsd 3.9 under FreeBSD.

gps_on

#! /bin/sh
#
# This script allows to use an Ericsson F5521gw mobile broadband module (aka
# Dell DW5500 or Hewlett-Packard HS2340) with gpsd 3.9 under FreeBSD.
#
# Source:    hxxp://wiki.volution.ro/CiprianDorinCraciun/Notes/Public/F5521gw
# Requires:  astro/gpsd, net/socat
# Usage:     gps_on [interval] [tempfile]


interval="${1:-10}"             # update interval in seconds (default: 10)
tempfile="${2:-/tmp/gps.data}"  # a pty the GPS data is redirected to


# Set up the card for GPS usage and stream the GPS data to a temporary pty
# NOTE: socat's "echo=0" prevents gpsd from using 100% CPU time
(
  exec <>/dev/cuaU2 >&0                 && \
  chat -s -S -t5 --                        \
    "*EMRDY: 1"  "AT"                      \
    "OK"         "AT+CFUN=1"               \
    "OK"         "AT*E2GPSCTL=1,$interval" \
    "OK"         "AT*E2GPSNPD"             \
    "OK"         ""                     && \
  exec socat                               \
    STDIO,echo=0                           \
    PTY,echo=0,link="$tempfile"
) &

# Run gpsd in read-only mode and have it take the GPS data from the pty
gpsd -b "$tempfile"