Hi,
I’m very happy coding away on the RAK4630 module. The supplied lorawan library works really nice with the eventing.
On my other lora devices, i can set a spreading factor. I’ve notived that the RAK4630 seems to be at SF7.
How can i set the spreading factor on these devices?
Hi @cyclops ,
Since you are using RAK4630 module, I will assume that you are using the RUI3 firmware. You can set the spreading factor via AT commands or RUI3 API.
Adding to this - the other code i used (sodaq) had SF things instead of DR. So i now understand that DR is linked directly to SF. Is that correct?
Hi @cyclops ,
I understand 
Looking at your code, you should be able to set the default DR on config.h. Specifically this int8_t _loraDataRate = DR_0;. However, you said you get SF7 which do not correspond with DR=0. Hmm. I think your code is based on @beegee’s work. So I believe he can give better insights 
DR and SF are related to one another. Values depends on your region. I advise you have a look on the regional document from LoRa Alliance.
To give example, DR0 is SF12 in EU868 while DR0 is SF10 in US915. Here’s the table for US915.
As you are using my SX126x-Arduino library, the API call to change the datarate is
/**@brief Configure data rate
*
* @param data_rate data rate
* @param enable_adr enable adaptative data rate
*/
void lmh_datarate_set(uint8_t data_rate, bool enable_adr);
As Carl said, SF and BW are combined in LoRaWAN specs into the data rate DR.
Beside of reading the official specs, you can have a quick overview in our Documentation Center where we show for most regions the possible datarate (with SF and BW), max payloads, …
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