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brocaar / chirpstack-network-server

ChirpStack Network Server is an open-source LoRaWAN network-server.
https://www.chirpstack.io
MIT License
1.49k stars 546 forks source link

change codeRate on loraWAN sensor node #207

Closed amaestrini closed 7 years ago

amaestrini commented 7 years ago

Dear Brocaar, we are very interesting in your project and we are testing LoRaWAN. We have a Lora App Server and Network server online and some gateways based on Raspberry Pi3 and a Concentrator (this one: https://wireless-solutions.de/products/radiomodules/ic880a.html) with the lora_pkt_fwd and lora-brige installed. For the sensor node we use an Arduino UNO with a Dragino GPS/Shield (with LMIC library for LoRaWAN stack https://github.com/matthijskooijman/arduino-lmic) and this code to send data: https://github.com/dragino/Lora/blob/master/Lora%20Shield/Examples/lora_shield_ttn/lora_shield_ttn.ino

It works both in ABP and OTAA, we receive the data on the LoRa app server.

Thanks a lot Andrea

brocaar commented 7 years ago

we are able to change spreading factor from 7 to 12 in ABP mode and not in OTA. May be with OTA is not possible to change spreading factor given that is the network server that has pre-configured values?

How do you change the spread-factor? In the firmware of the node itself? It might be an issue with the LMIC code.

Can I ask you moreover if you have an idea how to change the codeRate? (now is 4/5)

LoRa Server will use the same code-rate is used for the uplink. So when you transmit an uplink with a code-rate other than 4/5, that same code-rate will be used for downlink. Please refer the documentation / source of LMIC to find out you can change this.

amaestrini commented 7 years ago

Dear, thanks a lot for the info.

Yes I change the spreading factor in the node code related to the LMIC library, so it is the same for codeRate, you are right.

Thanks for your help Andrea

On Wed, Jul 19, 2017 at 2:59 PM, Orne Brocaar notifications@github.com wrote:

we are able to change spreading factor from 7 to 12 in ABP mode and not in OTA. May be with OTA is not possible to change spreading factor given that is the network server that has pre-configured values?

How do you change the spread-factor? In the firmware of the node itself? It might be an issue with the LMIC code.

Can I ask you moreover if you have an idea how to change the codeRate? (now is 4/5)

LoRa Server will use the same code-rate is used for the uplink. So when you transmit an uplink with a code-rate other than 4/5, that same code-rate will be used for downlink. Please refer the documentation / source of LMIC to find out you can change this.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/brocaar/loraserver/issues/207#issuecomment-316378041, or mute the thread https://github.com/notifications/unsubscribe-auth/AT2Kq-GTNWxcWspRyPoSyqEJrDyPyXVAks5sPf3AgaJpZM4OcapT .

-- Andrea Maestrini ing. ​Research engineer

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