Receive one uplink and it stops receiving frames right after

ChirpStack Network Server
1

Hi all

Just made (another) fresh install to try solving this issue but unfortunately did not work and still not having an idea.

This configuration worked fine before, then I had to move the server and the issue started.
No changes on test device, no changes on gateway.

First time I had launched the device, it worked fine, all frames, uplinks seemed ok.

After a hard reset on the device, after the join, only join and one uplink were received.

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My MQTT looks like:

ubuntu@ip-172-31-21-8:~$ mosquitto_sub -h localhost -t application/1/#
{“applicationID”:“1”,“applicationName”:“app”,“deviceName”:“Duino”,“devEUI”:“83105efba4a25b39”,“devAddr”:“01ec0a28”}
{“applicationID”:“1”,“applicationName”:“app”,“deviceName”:“Duino”,“devEUI”:“83105efba4a25b39”,“rxInfo”:[{“gatewayID”:“7076ff02acb2ffff”,“name”:“Kerlink”,“time”:“2019-05-07T00:49:14Z”,“rssi”:-67,“loRaSNR”:13.8,“location”:{“latitude”:0,“longitude”:0,“altitude”:700}}],“txInfo”:{“frequency”:903900000,“dr”:1},“adr”:true,“fCnt”:0,“fPort”:1,“data”:“SGVsbG8gV29ybGQgISEhISE=”}

My gateway doesn’t use bridge
My Gateway Bridge logs:

May 07 01:01:21 ip-172-31-21-8 lora-gateway-bridge[866]: time=“2019-05-07T01:01:21Z” level=info msg=“gateway: stat packet received” addr=“177.94.216.244:47480” mac=7076ff02acb2ffff
May 07 01:01:21 ip-172-31-21-8 lora-gateway-bridge[866]: time=“2019-05-07T01:01:21Z” level=info msg=“backend: publishing packet” qos=0 topic=gateway/7076ff02acb2ffff/stats
May 07 01:01:21 ip-172-31-21-8 lora-gateway-bridge[866]: time=“2019-05-07T01:01:21Z” level=info msg=“backend: config packet received” topic=gateway/7076ff02acb2ffff/config
May 07 01:01:21 ip-172-31-21-8 lora-gateway-bridge[866]: time=“2019-05-07T01:01:21Z” level=warning msg=“gateway: configuration was not applied, gateway is not configured for managed configuration” mac=7076ff02acb2ffff

This is level 5 gateway debug:

May 07 02:38:28 ip-172-31-21-8 lora-gateway-bridge[2745]: time=“2019-05-07T02:38:28Z” level=debug msg=“gateway: cleanup gateway registry”
May 07 02:38:28 ip-172-31-21-8 lora-gateway-bridge[2745]: time=“2019-05-07T02:38:28Z” level=debug msg=“gateway: received udp packet from gateway” addr=“177.94.216.244:13322” protocol_version=2 type=PushData
May 07 02:38:28 ip-172-31-21-8 lora-gateway-bridge[2745]: time=“2019-05-07T02:38:28Z” level=info msg=“mqtt: publishing message” qos=0 topic=gateway/7076ff02acb2ffff/stats
May 07 02:38:28 ip-172-31-21-8 lora-gateway-bridge[2745]: time=“2019-05-07T02:38:28Z” level=debug msg=“gateway: sending udp packet to gateway” addr=“177.94.216.244:13322” protocol_version=2 type=PushACK
May 07 02:38:28 ip-172-31-21-8 lora-gateway-bridge[2745]: time=“2019-05-07T02:38:28Z” level=info msg=“mqtt: gateway configuration received” topic=gateway/7076ff02acb2ffff/config
May 07 02:38:28 ip-172-31-21-8 lora-gateway-bridge[2745]: time=“2019-05-07T02:38:28Z” level=error msg=“apply packet-forwarder configuration error” error=“gateway does not exist”

Note the last line:
May 07 02:38:28 ip-172-31-21-8 lora-gateway-bridge[2745]: time=“2019-05-07T02:38:28Z” level=error msg=“apply packet-forwarder configuration error” error=“gateway does not exist”

My loraserver:

May 07 01:02:51 ip-172-31-21-8 loraserver[821]: time=“2019-05-07T01:02:51Z” level=info msg=“gateway/mqtt: gateway stats packet received” gateway_id=7076ff02acb2ffff
May 07 01:02:51 ip-172-31-21-8 loraserver[821]: time=“2019-05-07T01:02:51Z” level=info msg=“gateway updated” gateway_id=7076ff02acb2ffff
May 07 01:02:51 ip-172-31-21-8 loraserver[821]: time=“2019-05-07T01:02:51Z” level=info msg=“gateway/mqtt: publishing gateway configuration” qos=0 topic=gateway/7076ff02acb2ffff/config
May 07 01:02:51 ip-172-31-21-8 loraserver[821]: time=“2019-05-07T01:02:51Z” level=info msg=“metrics saved” aggregation=“[MINUTE HOUR DAY MONTH]” name=“gw:7076ff02acb2ffff”

And my lora app server:

May 07 00:48:33 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:48:33Z” level=info msg=“finished unary call with code OK” grpc.code=OK grpc.method=Get grpc.service=api.OrganizationService grpc.start_time=“2019-05-07T00:48:33Z” grpc.time_ms=2.896 peer.address=“127.0.0.1:40976” span.kind=server system=grpc
May 07 00:48:57 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:48:57Z” level=info msg=“js: request received” message_type=JoinReq receiver_id=0000000000000000 sender_id=000000 transaction_id=3002410996
May 07 00:48:57 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:48:57Z” level=info msg=“device-keys updated” dev_eui=83105efba4a25b39
May 07 00:48:57 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:48:57Z” level=info msg=“js: sending response” message_type=JoinAns receiver_id=000000 result_code=Success sender_id=0000000000000000 transaction_id=3002410996
May 07 00:49:09 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:09Z” level=info msg=“js: request received” message_type=JoinReq receiver_id=0000000000000000 sender_id=000000 transaction_id=2877428260
May 07 00:49:09 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:09Z” level=info msg=“device-keys updated” dev_eui=83105efba4a25b39
May 07 00:49:09 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:09Z” level=info msg=“js: sending response” message_type=JoinAns receiver_id=000000 result_code=Success sender_id=0000000000000000 transaction_id=2877428260
May 07 00:49:14 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:14Z” level=info msg=“device updated” dev_eui=83105efba4a25b39
May 07 00:49:14 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:14Z” level=info msg=“device-activation created” dev_eui=83105efba4a25b39 id=2
May 07 00:49:14 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:14Z” level=info msg=“integration/mqtt: publishing message” qos=0 topic=application/1/device/83105efba4a25b39/join
May 07 00:49:14 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:14Z” level=info msg=“finished unary call with code OK” grpc.code=OK grpc.method=HandleUplinkData grpc.request.deadline=“2019-05-07T00:49:15Z” grpc.service=as.ApplicationServerService grpc.start_time=“2019-05-07T00:49:14Z” grpc.time_ms=8.65 peer.address=“127.0.0.1:42726” span.kind=server system=grpc
May 07 00:49:14 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:49:14Z” level=info msg=“integration/mqtt: publishing message” qos=0 topic=application/1/device/83105efba4a25b39/rx
May 07 00:51:32 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:51:32Z” level=info msg=“finished unary call with code OK” grpc.code=OK grpc.method=Login grpc.service=api.InternalService grpc.start_time=“2019-05-07T00:51:32Z” grpc.time_ms=147.21 peer.address=“127.0.0.1:40970” span.kind=server system=grpc
May 07 00:51:41 ip-172-31-21-8 lora-app-server[879]: time=“2019-05-07T00:51:41Z” level=info msg=“finished unary call with code OK” grpc.code=OK grpc.method=Login grpc.service=api.InternalService grpc.start_time=“2019-05-07T00:51:41Z” grpc.time_ms=150.464 peer.address=“127.0.0.1:40970” span.kind=server system=grpc

and all the 3 repeats same log information from time to time.

The device still running, sending a fixed payload every each 10 seconds but nothing come to application server nor MQTT.

If it can be helpful, I’m using a Kerlink iFemtoCell and the led that indicates lora communication doesn’t blink anymore. Only when the device makes the join.

This is my config topic during JOIN:

ubuntu@ip-172-31-21-8:~$ mosquitto_sub -h localhost -t gateway/7076ff02acb2ffff/config
{“mac”:“7076ff02acb2ffff”,“version”:“2019-05-07T00:40:02.235976Z”,“channels”:[{“modulation”:“LORA”,“frequency”:902300000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]},{“modulation”:“LORA”,“frequency”:902500000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]},{“modulation”:“LORA”,“frequency”:902700000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]},{“modulation”:“LORA”,“frequency”:902900000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]},{“modulation”:“LORA”,“frequency”:903100000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]},{“modulation”:“LORA”,“frequency”:903300000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]},{“modulation”:“LORA”,“frequency”:903500000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]},{“modulation”:“LORA”,“frequency”:903700000,“bandwidth”:125,“spreadingFactors”:[7,8,9,10]}]}

If I connect the gateway to TTN, it receives all uplinks, every each 10 seconds.

EDIT 1
Just reinstalled following line by line from Quickstart guide and got exactly same behaviour.

Thank you for any help

2

It sounds like the channels in your enabled_uplink_channels and the channels configured on your gateway are out-of-sync. What probably happens is that after the first uplink, LoRa Server updates your device channel-mask and your device starts transmitting on channels that are not covered by your gateway(s), which explains that after the first uplink you won’t see any more data.

3

Hi @brocaar

You are right. And it shakes my brain.
I had a server working and receiving same payload, from same device, from same gateway for about 2 months non stop.

Then I started the migration to another server. I just copied all configuration files, installed new server from source and replaced the configuration by ones saved before.

In my backup config file I have:
enabled_uplink_channels=[0, 1, 2, 3, 4, 5, 6, 7]

Which is not working.

Replacing to:
enabled_uplink_channels=[]

Backed up and running.

It’s so confusing, I’m running on US-915.
The only thing that changed from one server to another was Loraserver version.

Anyway, thank you again for your help.

4

Generally US915 uses uplink channels 8-15. That would be especially true if you’ve been interoperating with TTN, which uses those.

Presumably when you stopped telling LoRaServer an incorrect list of channels 0-7, it stopped using MAC commands to tell the node to jump to channels which your gateways isn’t actually using, since your gateway ignored the config request.

5

You are right, TTN is using channels 8 - 15.

In one of the recent LoRa Server versions there has been an improvement in the service-profile Max DR value (previously cached on the device-session). It might be that this triggered the LinkADRReq to the device. Note that this mac-command also includes the channel-mask explaining why @Giulio_Loffreda only had this issue after upgrading.

6

Thank you both for the explanation !
Its nice to know I’m not loosing my mind.

Doing some tests playground, I could connect the device with different configurations:
enabled_uplink_channels=[]
Max Dr = 0

then
enabled_uplink_channels=[8, 9, 10, 11, 12, 13, 14, 15]
Max Dr = 3

I can see a slight performance improvement using second configuration.
In fact, I can have exactly same perf as TTN.

Before, with no uplinks, was little delayed and sometimes, loosing packets.

Considering I will have spread users with no access to Service Profile (it will come as standard) what you guys suggest ? Keep enabled uplinks 8 to 15 and Max Dr 3 ?

What’s the counter benefit I can have ?

EDIT

Looking on Getting Started Guide, I would suggest to change the tipo about uplinks:

US915 configuration example
[general]
log_level=4

[postgresql]
dsn=“postgres://loraserver_ns:dbpassword@localhost/loraserver_ns?sslmode=disable”

[network_server]
net_id=“000000”

[network_server.band]
name=“US_902_928”
enabled_uplink_channels=[0, 1, 2, 3, 4, 5, 6, 7]

It can lead to some mistake and thus, question for support.

Thank you

7

I had a similar issue and even posted about it: https://forum.loraserver.io/t/clearer-comments-regarding-enabled-uplink-channels-for-us-configuration/3794

having messaging in the example US config indicating channels 0-7 -> “Sub-Band 1”, 8-15 -> “Sub-Band 2” would have been very helpful since the “Sub-Band” terminology is how many devices refer to the uplink channel range

8

Feel free to create a pull-request to improve the comment :slight_smile:

9

I had this same issue and this thread helped me a lot. Since I’m doing sub-band 7 & 8 I might as well share my configuration:
I’m using a Tektelic Kona Macro 16-ch gateway and changed this file (on the CS server):
/etc/chirpstack-network-server/chirpstack-network-server.toml
Like this (it was on sub-band 2 only):
#enabled_uplink_channels=[8, 9, 10, 11, 12, 13, 14, 15, 65]
enabled_uplink_channels=[48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 70, 71]
I’m pretty sure channels 70 and 71 are the 500 kHz channels sitting in the center of the sub-bands 7 & 8.

Then on the gateway I changed this file:
/etc/default/config.json
I changed the frequencies to this:
{
“chip_enable”: true,
“chip_center_freq”: 912600000,
“chip_rf_chain”: 0,
“chan_multiSF_0”: { “chan_rx_freq”: 911900000, “spread_factor”: “7-12” },
“chan_multiSF_1”: { “chan_rx_freq”: 912100000, “spread_factor”: “7-12” },
“chan_multiSF_2”: { “chan_rx_freq”: 912300000, “spread_factor”: “7-12” },
“chan_multiSF_3”: { “chan_rx_freq”: 912500000, “spread_factor”: “7-12” },
“chan_multiSF_4”: { “chan_rx_freq”: 912700000, “spread_factor”: “7-12” },
“chan_multiSF_5”: { “chan_rx_freq”: 912900000, “spread_factor”: “7-12” },
“chan_multiSF_6”: { “chan_rx_freq”: 913100000, “spread_factor”: “7-12” },
“chan_multiSF_7”: { “chan_rx_freq”: 913300000, “spread_factor”: “7-12” },
“chan_LoRa_std” : { “chan_rx_freq”: 912600000, “bandwidth”: 500000, “spread_factor”: 8 },
“chan_FSK” : { “chan_rx_freq”: 912600000, “bandwidth”: 250000, “bit_rate”: 100000 }
},{
“chip_enable”: true,
“chip_center_freq”: 914200000,
“chip_rf_chain”: 0,
“chan_multiSF_0”: { “chan_rx_freq”: 913500000, “spread_factor”: “7-12” },
“chan_multiSF_1”: { “chan_rx_freq”: 913700000, “spread_factor”: “7-12” },
“chan_multiSF_2”: { “chan_rx_freq”: 913900000, “spread_factor”: “7-12” },
“chan_multiSF_3”: { “chan_rx_freq”: 914100000, “spread_factor”: “7-12” },
“chan_multiSF_4”: { “chan_rx_freq”: 914300000, “spread_factor”: “7-12” },
“chan_multiSF_5”: { “chan_rx_freq”: 914500000, “spread_factor”: “7-12” },
“chan_multiSF_6”: { “chan_rx_freq”: 914700000, “spread_factor”: “7-12” },
“chan_multiSF_7”: { “chan_rx_freq”: 914900000, “spread_factor”: “7-12” },
“chan_LoRa_std” : { “chan_rx_freq”: 914200000, “bandwidth”: 500000, “spread_factor”: 8 },
“chan_FSK” : { “chan_rx_freq”: 914200000, “bandwidth”: 250000, “bit_rate”: 100000 }
}],