Gruppo Meteo/HowTo/LorawanGateway

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LoRaWAN Gateway on rapberry, IMST iC880A Concentrator 868MHz, Centos 7

Main characteristics

  • User lorawan packet forwarder ( TTN legacy mode )
  • Remote access using ssh tunneling
  • Hardware reset for IMST concentrator
  • Autorestart services and network connections
  • Use system users for services (none run as root or privileged users)
  • All software (not configuration) is packaged and use standard public repo (not signed)
  • Use firewalld

Assemble the gateway

Parts:

Assemble the gateway as described at: https://github.com/ttn-zh/ic880a-gateway/wiki

Regulate the DC-DC power Supply to output 5.0V Connect the capacitor to the output of DC-DC power Supply Connect power supply to DC-DC input Connect DC-DC output to raspberry

Operative system

Follow https://wiki.centos.org/SpecialInterestGroup/AltArch/Arm32/RaspberryPi3

enable epel: 

cat > /etc/yum.repos.d/epel.repo << EOF
[epel]
name=Epel rebuild for armhfp
baseurl=https://armv7.dev.centos.org/repodir/epel-pass-1/
enabled=1
gpgcheck=0

EOF

enable ttn: 

cd /etc/yum.repos.d
wget http://rmap.cc/repo/ttn/rmapcentos.repo


change root password!

Install packages

TOBEDONE


chkconfig ttn-gateway on chkconfig ttn-imstreset-setgpio on


Autossh

  • attivare autossh, ossia un tunneling ssh su macchina pubblica per

permettere l'accesso remoto di amministrazione; infatti la connesione tramite wifi o ethernet o GSM non espongono un ip pubblico (almeno senza fare un reindirizzamento di porta):

yum install autossh da root: 

ssh-keygen
ssh-copy-id

/usr/lib/systemd/system/autossh.service 

[Unit]
Description=Autossh tunneling
After=network.target

[Service]
#User=ttn
#Group=ttn
WorkingDirectory=/root
#ExecStart=/usr/bin/autossh -M 5023  -N -R 5022:localhost:22 pat1@ttn.rmap.it
ExecStart=/usr/bin/autossh -M 0 -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -N -R 5022:localhost:22 <user>@<remotehost>
SyslogIdentifier=autossh
Restart=always
RestartSec=30

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
service autossh start
chkconfig autossh on

ora dalla macchina remota si può fare: 

ssh root@localhost -p5022

Pulsante poweoff

dnf install dbusgpio

/etc/dbus-1/system.d/dbusgpio.conf 

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">

<busconfig>

 <policy user="root">
   <allow send_destination="org.gpio.myboard.Pins"/>
   <allow own="org.gpio.myboard.Pins"/>
 </policy>

 <policy context="default">
   <allow receive_interface="org.gpio.myboard.Pins"/>
 </policy>

</busconfig>

/etc/dbusgpio/dbusgpio-site.cfg 

[dbusgpiod]

logfile  = '/var/log/dbusgpio/dbusgpiod.log'
errfile  = '/var/log/dbusgpio/dbusgpiod.err'
lockfile = '/var/run/dbusgpiod.lock'

busaddress='systembus'
pinlist= 18,

/usr/local/bin/poweroffd 

#!/usr/bin/env python
# GPL. (C) 2014 Paolo Patruno.

# This program is free software; you can redistribute it and/or modify 
# it under the terms of the GNU General Public License as published by 
# the Free Software Foundation; either version 2 of the License, or 
# (at your option) any later version. 
# 
# This program 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 General Public License for more details. 
# 
# You should have received a copy of the GNU General Public License 
# along with this program; if not, write to the Free Software 
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
# 

from dbusgpio import daemon
import dbus
import dbus.mainloop.glib
import gobject

#busaddress='tcp:host=192.168.1.180,port=1234'
busaddress=None

poweroffd = daemon.Daemon(
       stdin="/dev/null",
       stdout="/var/log/dbusgpio/poweroffd.log",
       stderr="/var/log/dbusgpio/poweroffd.err",
       pidfile="/var/run/poweroffd.lock",
#        user=autoradio.settings.user,
#        group=autoradio.settings.group
)

def poweroff():

   bus = dbus.SystemBus()
   ck = bus.get_object('org.freedesktop.login1',
                       '/org/freedesktop/login1')    
   p = dbus.Interface(ck,dbus_interface='org.freedesktop.login1.Manager')
   p.PowerOff(True)


def signal_handler(interface,properties,arg0):
   print "signal received"
   print "interface=",interface
   for prop in properties.keys():
       print prop, properties[prop]
       if prop == "Status" and properties[prop] == 0 :
           poweroff()
   #print arg0


def main(self):

   dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

   if busaddress is None:
       bus = dbus.SystemBus()
   else:
       bus = dbus.bus.BusConnection(busaddress)

   proxy = bus.get_object('org.gpio.myboard.Pins','/org/gpio/myboard')
   properties_manager = dbus.Interface(proxy, 'org.freedesktop.DBus.Properties')
   board_manager= dbus.Interface(proxy, 'org.gpio.myboard')

   if not properties_manager.Get('org.gpio.myboard', 'Running'):
       # start management of board pins
       board_manager.Raise('org.gpio.myboard')

   #pin 18 in
   properties_manager.Set('org.gpio.myboard.pins.channel18','Pull',"up")
   properties_manager.Set('org.gpio.myboard.pins.channel18','Mode',"in")
   print "18 status=", properties_manager.Get('org.gpio.myboard.pins.channel18','Status')

   bus.add_signal_receiver(signal_handler, dbus_interface = dbus.PROPERTIES_IFACE, signal_name = "PropertiesChanged")

   try:  
       loop = gobject.MainLoop()
       loop.run()

   except KeyboardInterrupt :
       # exit the management daemon
       board_manager.Quit('org.gpio.myboard')

if __name__ == '__main__':

   import sys, os
   poweroffd.cwd=os.getcwd()

   if poweroffd.service():

       sys.stdout.write("Daemon started with pid %d\n" % os.getpid())
       sys.stdout.write("Daemon stdout output\n")
       sys.stderr.write("Daemon stderr output\n")

       main(poweroffd)  # (this code was run as script)

       for proc in poweroffd.procs:
           proc.wait()

       sys.exit(0)

Assemblaggio

Connettere un pulsante normalmente apertro tra:

  • Physical pin 12; BCM pin 18; Wiring Pi pin 1
  • Physical pin 14; Ground

Monit

GSM

/etc/monit.d/gsm-connection (change usb_modeswitch command and serial port to adapt to your gsm modem): 

CHECK PROGRAM check_gsm PATH /usr/local/bin/check_gsm TIMEOUT 30 SECONDS
   if status != 0 then start

   start program = "/sbin/usb_modeswitch -v 12d1 -p 14fe -c /usr/share/usb_modeswitch/12d1:14fe ; sleep 10; /usr/bin/nmcli device connect ttyUSB2"
   stop program  = "/usr/bin/nmcli device disconnect ttyUSB2"


/usr/local/bin/check_gsm 

#!/bin/bash
set -e

# "Check Mobile Broadband Connection." 

# testing...to see if gsm is on the list of active devices

       LC_ALL=C nmcli -t -f TYPE,STATE dev | grep -q "^gsm:connected$"

Packet forwarder

/usr/local/bin/check_gateway (change your gateway id and coordinate): 

#!/usr/bin/python

import urllib2
import json
import dateutil.parser
import datetime
import sys

GATEWAYID="eui-0ceee6fffe9da82e"
LAT="44.48842723017417"
LON="11.26079806901295"

body=urllib2.urlopen("https://www.thethingsnetwork.org/gateway-data/location?latitude="+LAT+"&longitude="+LON+"&distance=15000").read()
gatewaydata=json.loads(body)
print gatewaydata[GATEWAYID]["last_seen"]

lastseen = dateutil.parser.parse(gatewaydata[GATEWAYID]["last_seen"]).replace(tzinfo=None)
now=datetime.datetime.utcnow()
print lastseen
print now

elapsed=now-lastseen
print "elapsed: ", elapsed
if ( elapsed > datetime.timedelta(seconds=300)):
   sys.exit(1)

sys.exit(0)

/etc/monit.d/gateway-connection 

CHECK PROGRAM gateway-connection PATH /usr/local/bin/check_gateway TIMEOUT 30 SECONDS
   if status != 0 then restart

   start program = "/usr/sbin/service ttn-gateway start"
   stop program  = "/usr/sbin/service ttn-gateway stop"

   every 5 cycles

Power off

/etc/monit.d/poweroff 

check process dbusgpiod with pidfile /var/run/dbusgpiod.lock

   start program = "/bin/dbusgpiod restart"
   stop program  = "/bin/dbusgpiod stop"


check process poweroffd with pidfile /var/run/poweroffd.lock

   start program = "/usr/local/bin/poweroffd restart"
   stop program  = "/usr/local/bin/poweroffd stop"
   depends on dbusgpiod

Activate monit

chkconfig monit on
service monit start

Firewall

dnf install firewalld
chkconfig firewalld on
service firewalld start
firewall-cmd --set-default-zone=block
Estratto da "https://www.raspibo.org/wiki/index.php?title=Gruppo_Meteo/HowTo/LorawanGateway&oldid=6619"