Hello
I recently started discovering LoRa. I have 2 Adafruit RFM9X LoRa modules. I created an application for each of them in ttn_v3 and can successfully transmit data from the nodes to ttn_v3. On the map I see that there are two gateways which are receiving my signal. They are in the neighbor towns, approx 2km and 3km away from me. So far so good 
Then I have started my own gateway. It is a IOT Gateway HAT for Raspberrypi. I have configured the gateway as best as I can. It connects also to the ttn_v3. Now there is a problem. As soon as I start my gateway, then my two nodes can’t connect to ttn anymore. I use the OTAA join process for them. So they aren’t able anymore to exchange the keys. And every join request ends up with: “EV_JOIN_TXCOMPLETE: no JoinAccept”. As soon as I stop my gateway with sudo systemctl stop iot-lora-gateway.service, then the two nodes can exchange again their’e keys.
In ttn under gateway I see this messages:
Receive join-request
Send join-request to cluster-local Join Server
Accept join-request
Join-request to cluster-local Join Server succeeded
Successfully processed join-request
Schedule join-accept for transmission on Gateway Server
Successfully scheduled join-accept for transmission on Gateway Server
Receive join-accept message
Forward join-accept message
Forward join-accept to Application server.
And for the same event on “Applications->End devices->Live data” I see the following:
Receive join-request
Send join-request to cluster-local Join Server
Join-request to cluster-local Join Server succeeded
Successfully processed join-request
Schedule join-accept for transmission on Gateway Server
Successfully scheduled join-accept for transmssion on Gateway Server
Receive join-accept message
Forward join-accept message
Forward join-accept to Application Server
I have configured the gateway according to this guide.
My global_conf.json file is attached to this post. The sensitive data are replaced by “xxxxxx…”. Maybe anyone can see If there is something wrong in my setup.
global_conf.json
{
“SX1301_conf”: {
“lorawan_public”: true,
“clksrc”: 1,
“antenna_gain”: 0,
“radio_0”: {
“enable”: true,
“type”: “SX1257”,
“freq”: 867500000,
“rssi_offset”: -166,
“tx_enable”: true,
“tx_freq_min”: 863000000,
“tx_freq_max”: 870000000
},
“radio_1”: {
“enable”: true,
“type”: “SX1257”,
“freq”: 868500000,
“rssi_offset”: -166,
“tx_enable”: false
},
“chan_multiSF_0”: {
“enable”: true,
“radio”: 1,
“if”: -400000
},
“chan_multiSF_1”: {
“enable”: true,
“radio”: 1,
“if”: -200000
},
“chan_multiSF_2”: {
“enable”: true,
“radio”: 1,
“if”: 0
},
“chan_multiSF_3”: {
“enable”: true,
“radio”: 0,
“if”: -400000
},
“chan_multiSF_4”: {
“enable”: true,
“radio”: 0,
“if”: -200000
},
“chan_multiSF_5”: {
“enable”: true,
“radio”: 0,
“if”: 0
},
“chan_multiSF_6”: {
“enable”: true,
“radio”: 0,
“if”: 200000
},
“chan_multiSF_7”: {
“enable”: true,
“radio”: 0,
“if”: 400000
},
“chan_Lora_std”: {
“enable”: true,
“radio”: 1,
“if”: -200000,
“bandwidth”: 250000,
“spread_factor”: 7
},
“chan_FSK”: {
“enable”: true,
“radio”: 1,
“if”: 300000,
“bandwidth”: 125000,
“datarate”: 50000
},
“tx_lut_0”: {
“pa_gain”: 0,
“mix_gain”: 8,
“rf_power”: -6,
“dig_gain”: 0
},
“tx_lut_1”: {
“pa_gain”: 0,
“mix_gain”: 10,
“rf_power”: -3,
“dig_gain”: 0
},
“tx_lut_2”: {
“pa_gain”: 0,
“mix_gain”: 12,
“rf_power”: 0,
“dig_gain”: 0
},
“tx_lut_3”: {
“pa_gain”: 1,
“mix_gain”: 8,
“rf_power”: 3,
“dig_gain”: 0
},
“tx_lut_4”: {
“pa_gain”: 1,
“mix_gain”: 10,
“rf_power”: 6,
“dig_gain”: 0
},
“tx_lut_5”: {
“pa_gain”: 1,
“mix_gain”: 12,
“rf_power”: 10,
“dig_gain”: 0
},
“tx_lut_6”: {
“pa_gain”: 1,
“mix_gain”: 13,
“rf_power”: 11,
“dig_gain”: 0
},
“tx_lut_7”: {
“pa_gain”: 2,
“mix_gain”: 9,
“rf_power”: 12,
“dig_gain”: 0
},
“tx_lut_8”: {
“pa_gain”: 1,
“mix_gain”: 15,
“rf_power”: 13,
“dig_gain”: 0
},
“tx_lut_9”: {
“pa_gain”: 2,
“mix_gain”: 10,
“rf_power”: 14,
“dig_gain”: 0
},
“tx_lut_10”: {
“pa_gain”: 2,
“mix_gain”: 11,
“rf_power”: 16,
“dig_gain”: 0
},
“tx_lut_11”: {
“pa_gain”: 3,
“mix_gain”: 9,
“rf_power”: 20,
“dig_gain”: 0
},
“tx_lut_12”: {
“pa_gain”: 3,
“mix_gain”: 10,
“rf_power”: 23,
“dig_gain”: 0
},
“tx_lut_13”: {
“pa_gain”: 3,
“mix_gain”: 11,
“rf_power”: 25,
“dig_gain”: 0
},
“tx_lut_14”: {
“pa_gain”: 3,
“mix_gain”: 12,
“rf_power”: 26,
“dig_gain”: 0
},
“tx_lut_15”: {
“pa_gain”: 3,
“mix_gain”: 14,
“rf_power”: 27,
“dig_gain”: 0
}
},
“gateway_conf”: {
“gateway_ID”: “xxxxxxx”,
“gps”:true,
“beacon”: true,
“logger”: true,
“upstream”: true,
“downstream”: true,
“ghoststream”: false,
“radiostream”: true,
“statusstream”: true,
“servers”: [
{
“server_address”: “eu1.cloud.thethings.network”,
“gateway_ID”: “xxxxxxxx”,
“serv_port_up”: 1700,
“serv_port_down”: 1700,
“serv_max_stall”: 0,
“serv_enabled”: true
}
],
“keepalive_interval”: 10,
“stat_interval”: 30,
“push_timeout_ms”: 100,
“forward_crc_valid”: true,
“forward_crc_error”: false,
“forward_crc_disabled”: false,
“gps_tty_path”:“/dev/serial0”,
“stat_format”: “semtech”,
“stat_damping”: 0,
“stat_file”: “stats.txt”,
“platform”: “TTN”,
“contact_email”: “xxx@xxxxxxxx.ch”,
“description”: “Gateway von MiracuruZRH”,
“fake_gps”: false,
“ref_latitude”: 47.30502781183416,
“ref_longitude”: 8.758851884436076,
“ref_altitude”: 470,
“serv_gw_key”: “NNSXS.xxxxxxxxxxxxxx.xxxxxxxxxxxxxx”
}
}
log from packet forwarder
root
00:14:47 *** Multi Protocol Packet Forwarder for Lora Gateway ***
Version: 3.0.20
00:14:47 *** Lora concentrator HAL library version info ***
Version: 5.0.1; Options: native;
00:14:47 INFO: Little endian host
00:14:47 INFO: found global configuration file /opt/iotloragateway/global_conf.json, parsing it
00:14:47 INFO: /opt/iotloragateway/global_conf.json does contain a JSON object named SX1301_conf, parsing SX1301 parameters
00:14:47 INFO: lorawan_public 1, clksrc 1
00:14:47 INFO: no configuration for LBT
00:14:47 INFO: antenna_gain 0 dBi
00:14:47 INFO: Configuring TX LUT with 16 indexes
00:14:47 INFO: radio 0 enabled (type SX1257), center frequency 867500000, RSSI offset -166.000000, tx enabled 1
00:14:47 INFO: radio 1 enabled (type SX1257), center frequency 868500000, RSSI offset -166.000000, tx enabled 0
00:14:47 INFO: Lora multi-SF channel 0> radio 1, IF -400000 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora multi-SF channel 1> radio 1, IF -200000 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora multi-SF channel 2> radio 1, IF 0 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora multi-SF channel 3> radio 0, IF -400000 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora multi-SF channel 4> radio 0, IF -200000 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora multi-SF channel 5> radio 0, IF 0 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora multi-SF channel 6> radio 0, IF 200000 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora multi-SF channel 7> radio 0, IF 400000 Hz, 125 kHz bw, SF 7 to 12
00:14:47 INFO: Lora std channel> radio 1, IF -200000 Hz, 250000 Hz bw, SF 7
00:14:47 INFO: FSK channel> radio 1, IF 300000 Hz, 125000 Hz bw, 50000 bps datarate
00:14:47 INFO: /opt/iotloragateway/global_conf.json does contain a JSON object named gateway_conf, parsing gateway parameters
00:14:47 INFO: gateway MAC address is configured to A0F3C2D1A03357E2
00:14:47 INFO: Found 1 servers in array.
00:14:47 INFO: Server 0 configured to “eu1.cloud.thethings.network”
00:14:47 INFO: format is configured to “semtech”
00:14:47 INFO: filename for statistical performance is configured to “stats.txt”
00:14:47 INFO: Damping for statistical info is configured to 95%
00:14:47 INFO: downstream keep-alive interval is configured to 10 seconds
00:14:47 INFO: statistics display interval is configured to 30 seconds
00:14:47 INFO: upstream PUSH_DATA time-out is configured to 100 ms
00:14:47 INFO: packets received with a valid CRC will be forwarded
00:14:47 INFO: packets received with a CRC error will NOT be forwarded
00:14:47 INFO: packets received with no CRC will NOT be forwarded
00:14:47 INFO: GPS serial port path is configured to “/dev/serial0”
00:14:47 INFO: Reference latitude is configured to 47.305028 deg
00:14:47 INFO: Reference longitude is configured to 8.758852 deg
00:14:47 INFO: Reference altitude is configured to 470 meters
00:14:47 INFO: GPS is enabled
00:14:47 INFO: Using real GPS if available.
00:14:47 INFO: Upstream data is enabled
00:14:47 INFO: Downstream data is enabled
00:14:47 INFO: Ghoststream data is disabled
00:14:47 INFO: Radiostream data is enabled
00:14:47 INFO: Statusstream data is enabled
00:14:47 INFO: Beacon is enabled
00:14:47 INFO: Packet logger is disabled
00:14:47 INFO: Flush output after statistic is disabled
00:14:47 INFO: Flush after each line of output is disabled
00:14:47 INFO: Watchdog is disabled
00:14:47 INFO: Platform configured to “ttn”
00:14:47 INFO: Contact email configured to “xxxx@xxxxxxxxxx.ch”
00:14:47 INFO: Description configured to “Gateway von MiracuruZRH”
00:14:47 INFO: [main] TTY port /dev/serial0 open for GPS synchronization
00:14:47 INFO: [Transports] Initializing protocol for 1 servers
00:14:47 INFO: Successfully contacted server eu1.cloud.thethings.network
00:14:47 INFO: [main] Starting the concentrator
00:14:50 INFO: [main] concentrator started, radio packets can now be received.
00:14:50 INFO: [up] Thread activated for all servers.
00:14:50 INFO: JIT thread activated.
00:14:50 INFO: Disabling GPS mode for concentrator’s counter…
00:14:50 INFO: Validation thread activated.
00:14:50 INFO: host/sx1301 time offset=(1635372888s:272043µs) - drift=-334189397µs
00:14:50 INFO: Enabling GPS mode for concentrator’s counter.
00:14:50 WARNING: [gps] GPS out of sync, keeping previous time reference
00:14:50 WARNING: [gps] GPS out of sync, keeping previous time reference
INFO: tx_start_delay=1495 (1495.500000) - (1497, bw_delay=1.500000, notch_delay=0.000000)
src/mp_pkt_fwd.c:1671:thread_jit(): lgw_send done: count_us=20231116
INFO: tx_start_delay=1495 (1495.500000) - (1497, bw_delay=1.500000, notch_delay=0.000000)
src/mp_pkt_fwd.c:1671:thread_jit(): lgw_send done: count_us=29648292
2021-10-27 22:15:20 GMT
[UPSTREAM]
RF packets received by concentrator: 2
CRC_OK: 100.00%, CRC_FAIL: 0.00%, NO_CRC: 0.00%
RF packets forwarded: 2 (46 bytes)
PUSH_DATA datagrams sent: 2 (544 bytes)
PUSH_DATA acknowledged: 100.00%
[DOWNSTREAM]
PULL_DATA sent: 3 (100.00% acknowledged)
PULL_RESP(onse) datagrams received: 2 (418 bytes)
RF packets sent to concentrator: 2 (66 bytes)
TX errors: 0
TX rejected (collision packet): 0.00% (req:2, rej:0)
TX rejected (collision beacon): 0.00% (req:2, rej:0)
TX rejected (too late): 0.00% (req:2, rej:0)
TX rejected (too early): 0.00% (req:2, rej:0)
[BEACON]
Packets queued: 0
Packets sent so far: 0
Packets rejected: 0
[JIT]
INFO: JIT queue contains 0 packets.
INFO: JIT queue contains 0 beacons.
[GPS] ###Processing: global_conf.json…
Valid gps time reference (age: 0 sec)
System GPS coordinates: latitude 47.30510, longitude 8.75909, altitude 452 m
[PERFORMANCE]
Upstream radio packet quality: 100.00%.
Upstream datagram acknowledgment quality for server “eu1.cloud.thethings.network” is 100.00%.
Downstream heart beat acknowledgment quality for server “eu1.cloud.thethings.network” is 100.00%.
Downstream datagram content quality for server “eu1.cloud.thethings.network” is 100.00%.
Downstream radio transmission quality for server “eu1.cloud.thethings.network” is 100.00%.
Downstream beacon transmission quality: 0.00%.
[ CONNECTIONS ]
Semtech status report send.
END
00:15:50 INFO: Disabling GPS mode for concentrator’s counter…
00:15:50 INFO: host/sx1301 time offset=(1635372888s:278724µs) - drift=6681µs
00:15:50 INFO: Enabling GPS mode for concentrator’s counter.
I further data or infos are needed, please let me know.
The funny thing is, once my nodes are connected to ttn, then I can start my gateway and It receives the data and forward’s it to the ttn without problems.
And one more thing. I have created an API key for the gateway which I have then entered in the configuration file with “serv_gw_key”: “NNSXS.xxxxxxxxxxxxxx.xxxxxxxxxxxxxx”
I tried it also instead to have the key here that I give a path with a .txt file where the key is stored in.
So I have noticed that also when the complete entry “serv_gw_key” is missing the gateway connects successfully to ttn_v3.
Would be much appreciated if someone could help me to get the gateway running correctly.
