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Spreading factor

hey every one.
Im newbie in lora communications.
my question is about how should i make sure that gateway received message from node according to CRC.
and how should i set the spreading factor?
whether spreading factor in node and gateway must be the same?

Hello @amirabbas.elc.eng,

You are referring to a gateway - is it a LoRaWAN gateway?

It depends on the chip you are talking about. Usually, thanks to the dedicated driver, you can configure the LoRa parameters you want to use.

Basically, when 2 devices want to exchange a LoRa message, parameters have to be the same (spreading factor, bandwidth, coding rate, CRC, header mode).