Evening all,
So I’m trying to get my development gateway up and running with the above GPS module.
I read this thread (Raspberry Pi 3 + IC880a + GPS) which despite being for the containerised resio.io setup, was very useful. In short: the module is soldered in, I had it working fine with Raspian and gpsd.
I’ve since disabled the gpsd service, and reconfigured the Pi to route the module via the h/w UART. sudo cat /dev/ttyAMA0 shows the NMEA data stream. I’ve physically disconnected the RX wire from the GPS module.
I enable gps in config and restart, and the packet forwarder appears to pick up the GPS fine (see log below). However, at some point along the process I seem to have screwed up something, as it doesn’t start the concentrator 
Feels like I’m very close, I’m not even convinced it’s related to the GPS module itself. I’m open to suggestions where to look next!
Mark
*** Poly Packet Forwarder for Lora Gateway ***
Version: 2.1.0
*** Lora concentrator HAL library version info ***
Version: 3.1.0; Options: native;
INFO: Little endian host
INFO: found global configuration file global_conf.json, parsing it
INFO: global_conf.json does contain a JSON object named SX1301_conf, parsing SX1301 parameters
INFO: lorawan_public 1, clksrc 1
INFO: Configuring TX LUT with 16 indexes
INFO: radio 0 enabled (type SX1257), center frequency 867500000, RSSI offset -166.000000, tx enabled 1
INFO: radio 1 enabled (type SX1257), center frequency 868500000, RSSI offset -166.000000, tx enabled 0
INFO: Lora multi-SF channel 0> radio 1, IF -400000 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora multi-SF channel 1> radio 1, IF -200000 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora multi-SF channel 2> radio 1, IF 0 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora multi-SF channel 3> radio 0, IF -400000 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora multi-SF channel 4> radio 0, IF -200000 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora multi-SF channel 5> radio 0, IF 0 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora multi-SF channel 6> radio 0, IF 200000 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora multi-SF channel 7> radio 0, IF 400000 Hz, 125 kHz bw, SF 7 to 12
INFO: Lora std channel> radio 1, IF -200000 Hz, 250000 Hz bw, SF 7
INFO: FSK channel> radio 1, IF 300000 Hz, 125000 Hz bw, 50000 bps datarate
INFO: global_conf.json does contain a JSON object named gateway_conf, parsing gateway parameters
INFO: gateway MAC address is configured to AA555A0000000000
INFO: Found 2 servers in array.
INFO: Server 0 configured to “127.0.0.1”, with port up “1680” and port down "1681"
INFO: Server 1 configured to “iot.semtech.com”, with port up “1680” and port down "1680"
INFO: Found 5 system calls in array.
INFO: System command 0: "df -m"
INFO: System command 1: "free -h"
INFO: System command 2: "uptime"
INFO: System command 3: "who -a"
INFO: System command 4: "uname -a"
INFO: monitor hostname or IP address is configured to "127.0.0.1"
INFO: monitor port is configured to "2008"
INFO: ghost hostname or IP address is configured to "127.0.0.1"
INFO: ghost port is configured to "1918"
INFO: downstream keep-alive interval is configured to 10 seconds
INFO: statistics display interval is configured to 30 seconds
INFO: upstream PUSH_DATA time-out is configured to 100 ms
INFO: packets received with a valid CRC will be forwarded
INFO: packets received with a CRC error will NOT be forwarded
INFO: packets received with no CRC will NOT be forwarded
INFO: GPS serial port path is configured to "/dev/ttyAMA0"
INFO: SSH path is configured to "/usr/bin/ssh"
INFO: SSH port is configured to 22
INFO: HTTP port is configured to 80
INFO: NGROK path is configured to "/usr/bin/ngrok"
INFO: Reference latitude is configured to 10.000000 deg
INFO: Reference longitude is configured to 20.000000 deg
INFO: Reference altitude is configured to -1 meters
INFO: GPS is enabled
INFO: Using fake GPS coordinates instead of real.
INFO: antenna_gain 0 dBi
INFO: Upstream data is enabled
INFO: Downstream data is enabled
INFO: Ghoststream data is disabled
INFO: Radiostream data is enabled
INFO: Statusstream data is enabled
INFO: Beacon is disabled
INFO: Monitor is disabled
INFO: Platform configured to "IMST + Rpi"
INFO: Contact email configured to "operator@gateway.tst"
INFO: Description configured to "Update me"
INFO: found local configuration file local_conf.json, parsing it
INFO: redefined parameters will overwrite global parameters
INFO: local_conf.json does not contain a JSON object named SX1301_conf
INFO: local_conf.json does contain a JSON object named gateway_conf, parsing gateway parameters
INFO: gateway MAC address is configured to B827EBFFFE329883
INFO: Found 1 servers in array.
INFO: Server 0 configured to “router.eu.thethings.network”, with port up “1700” and port down "1700"
INFO: packets received with a valid CRC will be forwarded
INFO: packets received with a CRC error will NOT be forwarded
INFO: packets received with no CRC will NOT be forwarded
INFO: GPS serial port path is configured to "/dev/ttyAMA0"
INFO: Reference latitude is configured to 51.489900 deg
INFO: Reference longitude is configured to 0.304300 deg
INFO: Reference altitude is configured to 12 meters
INFO: GPS is enabled
INFO: Using real GPS if available.
INFO: antenna_gain 0 dBi
INFO: Upstream data is enabled
INFO: Downstream data is enabled
INFO: Ghoststream data is disabled
INFO: Radiostream data is enabled
INFO: Statusstream data is enabled
INFO: Beacon is disabled
INFO: Monitor is disabled
INFO: Contact email configured to "mark@annasach.net"
INFO: Description configured to "LoRaWAN Brentford Development"
INFO: [main] TTY port /dev/ttyAMA0 open for GPS synchronization
INFO: Successfully contacted server router.eu.thethings.network
INFO: [main] Starting the concentrator
ERROR: [main] failed to start the concentrator
Doesn’t it persist?
Fixing that means I get reliable data from the module.