LHT52 no uplink

[Paweł Czapski]

Hello,

I have an LHT52 with the latest firmware. The Dragino device successfully joins my gateway, which is an Elecrow single-channel gateway. After joining, the green light stays on for 5 seconds—everything seems fine.

However, there is absolutely no uplink from the LHT52. It doesn't upload any data at all.

Right after joining, it seems like it tries to upload something, but nothing appears in TTN.

Dragino LHT52 Device

Image Version:v1.2
LoRaWan Stack:DR-LWS-005
Frequency Band: EU868
DevEui= 
Enter Password to Active AT Commands

***** UpLinkCounter= 0 *****
TX on freq 868100000 Hz at DR 5
txDone

RX on freq 868100000 Hz at DR 5
rxTimeOut
RX on freq 869525000 Hz at DR 0
rxTimeOut

***** UpLinkCounter= 0 *****
TX on freq 868300000 Hz at DR 5
txDone
RX on freq 868300000 Hz at DR 5
rxTimeOut
RX on freq 869525000 Hz at DR 0
rxTimeOut

***** UpLinkCounter= 0 *****
TX on freq 868100000 Hz at DR 5
txDone
RX on freq 868100000 Hz at DR 5
rxDone
JOINED

***** UpLinkCounter= 0 *****
TX on freq 868100000 Hz at DR 0
txDone
RX on freq 868100000 Hz at DR 0
rxTimeOut
RX on freq 869525000 Hz at DR 0
rxTimeOut

***** UpLinkCounter= 1 *****
TX on freq 867500000 Hz at DR 0
txDone
RX on freq 867500000 Hz at DR 0
rxTimeOut
RX on freq 869525000 Hz at DR 0
rxTimeOut

Sensor TTN:

GW TTN:

[b jg]

Hi,pcza

If you are using a single channel gateway.
Your node also needs to lock the channel and send single channel frequency.
Check from your node log that it uses multiple channels.
Please use the following command to lock the node channel:

[Paweł Czapski]

Hello,

thanks for hints. I have changed CHS to make it single channel mode compatible, however, still no luck. LHT52 is not sending any upload after joining.

AT+ADR=1
AT+DR=0
AT+TXP=0
AT+CHS=868100000
AT+CLASS=A
AT+CFM=0,7,0
AT+JN1DL=5000
AT+JN2DL=6000
AT+RX1DL=5000
AT+RX2DL=6000
AT+RX1WTO=6
AT+RX2WTO=6
AT+RX2FQ=869525000
AT+RX2DR=0
AT+RPL=0
AT+FCU=2
AT+FCD=0
AT+CFS=0
AT+NJS=1
AT+DCS=0
AT+PNM=1
AT+PWORD=123456
AT+EXT=1
AT+TDC=1200000
AT+TIMESTAMP=255 1970 1 1 0 4 15
AT+RJTDC=20
AT+DDETECT=1,1440
AT+WMOD=1
AT+CITEMP=1
AT+ARTEMP=-40,125
AT+SETMAXNBTRANS=1,0
OK

[b jg]

Because your gateway is a single channel gateway, it can only downlink one frequency point.
The acceptance frequency of the node should also be 86810000
Please set the following command to try again to see if the device has successfully connected to the network.
AT+RX2FQ=868100000

[Paweł Czapski]

Hello,

I did as you suggested, but it looks that lht52 after joining the ttn is no more sending any uplink. Would it be possible? Or should I switch to non-single lora GW?

[b jg]

Hi,pcza

If the TTN server keeps publishing downlink information.
In this case it is automatically adding frequencies to the node.
Do you mind using ABP mode to join the TTN server?

If you have a multi-channel gateway, it is more convenient for it to join the network.