# How do send CO values from my Lopy4 to my gateway(Lora Hat + Raspberry pi 3)
**URL:** https://discourse.nodered.org/t/how-do-send-co-values-from-my-lopy4-to-my-gateway-lora-hat-raspberry-pi-3/41240
**Category:** Forum Help
**Created:** [18 February 2021 13:51 UTC](https://discourse.nodered.org/t/how-do-send-co-values-from-my-lopy4-to-my-gateway-lora-hat-raspberry-pi-3/41240 "2021-02-18T13:51:46Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@bmavina](https://discourse.nodered.org/u/bmavina)
#### Post date: [18 February 2021 13:51 UTC](https://discourse.nodered.org/t/how-do-send-co-values-from-my-lopy4-to-my-gateway-lora-hat-raspberry-pi-3/41240/1 "2021-02-18T13:51:46Z")
Hi,
So im currently working on a project that that sends CO values from a sensor to TTN and from there to Node-red and from Node-Red to Grafana. I will also have to build a gateway to connect it to TTN and I will build this gateway using The Lora Hat and a Raspberry Pi 3. I am seeking help because I don't know how im going to send the values from my CO sensor from my Lopy4 to my gateway that is connected to TTN. Do i have to send the data at the same frequency as the gateway? or do something completely different? And is there a tutorial for this specific task?
Any insights to this will help a lot and im open to hearing any suggestions
Thank you
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### Author:  [@ghayne](https://discourse.nodered.org/u/ghayne)
#### Post date: [18 February 2021 14:15 UTC](https://discourse.nodered.org/t/how-do-send-co-values-from-my-lopy4-to-my-gateway-lora-hat-raspberry-pi-3/41240/2 "2021-02-18T14:15:53Z")
Can't you use the MQTT protocol over LoRa?
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### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [18 February 2021 16:13 UTC](https://discourse.nodered.org/t/how-do-send-co-values-from-my-lopy4-to-my-gateway-lora-hat-raspberry-pi-3/41240/3 "2021-02-18T16:13:38Z")
no you can't. in some modes you can send about 22 bytes every minute or so... not over the air no. Yes from the gateway back wherever - absolutely... But the whole Lopy Lora to TTN question is nothing to do with Node-RED - so would be better answered on a dedicated Lopy or TTN forum.