LoRa gateway to Habitat
C Python Other
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README.md
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README.md

Part of the LoRa Balloon Tracking System

Runs on a Raspberry Pi with 1 or 2 RFM98HW modules attached to the SPI port. Also works with other compatible HopeRF and Semtec LoRa devices.

Connections

If you're making your own board for the Pi, connect the LoRa module(s) like so:

LORA     PI
----     --
3.3V    3.3V Power
GND     Ground
MOSI    MOSI (pin 19)
MISO    MISO (pin 21)
NSS     CE0 (pin 24) (CE1 (pin 26) for 2nd module)
SCK     SLCK
DIO0    Wiring Pi 31 (Pin 28) (Wiring Pi 6 (pin 22) for 2nd module)
DIO5    Wiring Pi 26 (Pin 32) (Wiring Pi 5 (pin 18) for 2nd module)

Installation

Enable SPI in raspi-config.

Install WiringPi:

1. cd ~
2. git clone git://git.drogon.net/wiringPi
3. cd wiringPi
4. ./build

Install the curl library:

sudo apt-get install libcurl4-openssl-dev

Install the ncurses library

sudo apt-get install libncurses5-dev

Install the LoRa gateway

1. cd ~ 
2. git clone https://github.com/PiInTheSky/lora-gateway.git
3. cd lora-gateway
4. make
5. cp gateway_sample.txt gateway.txt

** That last step is new - to prevent overwriting existing configurations, gateway.txt is supplied as a sample file that you need to copy first **

Configuration

The configuration is in the file gateway.txt. Example:

tracker=M0RPI
EnableHabitat=N
EnableSSDV=Y
LogTelemetry=Y
LogPackets=Y
CallingTimeout=60
JPGFolder=ssdv
CallingTimeout=60
ServerPort=6004
Latitude=51.95023
Longitude=-2.5445 
Antenna=868MHz Yagi

frequency_0=434.347
mode_0=1
DIO0_0=31
DIO5_0=26
AFC_0=N

frequency_1=434.475
mode_1=5
DIO0_1=6
DIO5_1=5
AFC_1=Y

The global options are:

tracker=<callsign>.  This is whatever callsign you want to appear as on the tracking map and/or SSDV page.

EnableHabitat=<Y/N>.  Enables uploading of telemetry packets to Habitat.

EnableSSDV=<Y/N>.  Enables uploading of SSDV image packets to the SSDV server.

JPGFolder=<folder>.  Tells the gateway where to save local JPEG files built from incoming SSDV packets.

LogTelemetry=<Y/N>.  Enables logging of telemetry packets (ASCII only at present) to telemetry.txt. 

LogPackets=<Y/N>.  Enables logging of packet information (SNR, RSSI, length, type) to packets.txt.  

SMSFolder=<folder>.  Tells the gateway to check for incoming SMS messages or tweets that should be sent to the tracker via the uplink.

CallingTimeout=<seconds>.  Sets a timeout for returning to calling mode after a period with no received packets.

ServerPort=<port>.  Opens a server socket which can have 1 client connected.  Sends JSON telemetry and status information to that client.

Latitude=<decimal position>
Longitude=<decimal position>.  These let you tell the gateway your position, for uploading to habitat, so your listener icon appears on the map in the correct position.
Antenna=<antenna make/model>.  Lets you specify your antenna make/model or type.  This appears on the map if your listener icon is clicked on.

NetworkLED=<wiring pi pin>
InternetLED=<wiring pi pin>
ActivityLED_0=<wiring pi pin>
ActivityLED_1=<wiring pi pin>.  These are used for LED status indicators. Useful for packaged gateways that don't have a monitor attached.

and the channel-specific options are:

frequency_<n>=<freq in MHz>.  This sets the frequency for LoRa module <n> (0 for first, 1 for second).  e.g. frequency_0=434.450

AFC_<n>=<Y/N>.  Enables or disables automatic frequency control (retunes by the frequency error of last received packet).

mode_<n>=<mode>.  Sets the "mode" for the selected LoRa module.  This offers a simple way of setting the various
                LoRa parameters (SF etc.) in one go.  The modes are:

                0 = (normal for telemetry)  Explicit mode, Error coding 4:8, Bandwidth 20.8kHz, SF 11, Low data rate optimize on
                1 = (normal for SSDV)       Implicit mode, Error coding 4:5, Bandwidth 20.8kHz,  SF 6, Low data rate optimize off
                2 = (normal for repeater)   Explicit mode, Error coding 4:8, Bandwidth 62.5kHz,  SF 8, Low data rate optimize off
                3 = (normal for fast SSDV)  Explicit mode, Error coding 4:6, Bandwidth 250kHz,   SF 7, Low data rate optimize off
                4 = Test mode not for normal use.
                5 = (normal for calling mode)   Explicit mode, Error coding 4:8, Bandwidth 41.7kHz, SF 11, Low data rate optimize off

SF_<n>=<Spreading Factor>  e.g. SF_0=7

Bandwidth_<n>=<Bandwidth>.  e.g. Bandwidth_0=41K7.  Options are 7K8, 10K4, 15K6, 20K8, 31K25, 41K7, 62K5, 125K, 250K, 500K

Implicit_<n>=<Y/N>.  e.g. Implicit_0=Y

Coding_<n>=<error_coding>.  e.g. Coding_0=5 (4:5)

lowopt_<n>=<Y/N>.  Enables or disables low data rate optimization.

power_<n>=<power>.  This is the power setting used for uplinks.  Refer to the LoRa manual for details on setting this.  ** Only set values that are legal in your location (for EU see IR2030) **

UplinkTime_0=<seconds>.  When to send any uplink messages, measured as seconds into each cycle.

UplinkCycle_0=<seconds>.  Cycle time for uplinks.  First cycle starts at 00:00:00.  So for uplink time=2 and cycle=30, any transmissions will start at 2 and 32 seconds after each minute.

Lines are commented out with "#" at the start.

If the frequency_n line is commented out, then that channel is disabled.

Uplinks

The gateway can uplink messages to the tracker. Currently this is restricted to time-based uplink slots using "UplinkTime" and "UplinkCycle".

The code uses Linux system time, so the gateway should ideally be using a GPS receiver the GPSD daemon. NTP may prove sufficient however.

For uplinks to work, both UplinkTime and UplinkCycle have to be set for the appropriate channel.

There are currently two types of uplink supported:

-   Uplink of messages from the "SMSFolder" folder.  For this to work, "SMSFolder" has to be defined and present.  The gateway will then check for "*.sms" files in that folder.
-   Uplink of SSD packet re-send requests.  The gateway looks for an "uplink.txt" file in the gateway folder.  The file is created by an external Python script (supplied) which interrogates the SSDV server.

Calling Mode

It is possible for trackers to send out messages on a special "calling channel" as well as telemetry on their main frequency. The calling channel messages state the main frequency and LoRa modes.

This allows for gateways tp be normally left on the calling channel, so they then switch to each tracker as it comes within range.

There's nothing special about "calling mode" except that after a period (CallingTimeout seconds) of time without packets, the gateway returns to its default settings.

There is no current standard claling channel.

Use

Run with:

sudo ./gateway

Display

The display has a title bar at the top, scrolling log at the bottom, and 2 channel panels in the middle. Each panel shows something like:

Channel 0 869.8500MHz
Explicit, 250k, SF7, EC4:6
Telemetry 74 bytes
51.95028, -2.54443, 00138
Habitat        SSDV 0000
0s since last packet
Telem Packets = 37
Image Packets = 0
Bad CRC = 0 Bad Type = 0
Packet SNR = 10, RSSI = -67
Freq. Error =   1.0kHz
Current RSSI =  -64

The "Habitat" text appears during uploads to habitat. Normally it will flash up then disappear quickly; if it stays on (not flickering) then the upload is slow.

The "SSDV 0000" text shows the current state of the SSDV upload buffers. There are 4 upload threads and each can handle up to 16 (0-9-A-F) packets in its queue. Normally, even with fast SSDV, uplinks should happen quickly enough for there to be no more than 1 or 2 active threads each with 1 packet being uploaded.

Interactive Features

The following key presses are available. Where appropriate unshifted keys affect Channel 0 and shifted keys affect Channel 1. Many thanks to David Brooke for coding this feature and the AFC.

q   quit

a   increase frequency by 100kHz
z   decrease frequency by 100kHz
s   increase frequency by 10kHz
x   decrease frequency by 10kHz
d   increase frequency by 1kHz
c   decrease frequency by 1kHz

f   toggle AFC

Change History

27/06/2016 - V1.6

Single SSDV upload thread using new API to upload multiple packets at once
Fixed 100% CPU (SSDV thread not sleeping)

23/05/2016 - V1.5

Better status screen

13/05/2016

Bug fux to local conversion of large SSDV images
Added packet logging

04/04/2016

SSDV 8 buffers
JSON feed instead of old "transition" method

19/02/2016

Fixed listener_information JSON
Added antenna setting to gateway.txt

16/02/2016

JSON telemetry feed via a server port
JPEGFolder setting
Uplink of text messages to tracker (e.g. accepted from Twitter by an external script)
Uplink of SSDV re-send requests.  These requests are built by an external Python script.
Separate thread for uploading latest telemetry to habitat
4 separate threads for uploading SSDV packets to the SSDV server
Slightly different display layout, with extra information

07/10/2015

fsphil: Tidied up compiler warnings, makefile, file permissions