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Node Gateway communication

Hi,

There are lots of companies selling Lora gateway. But there is no information about the node.
Like,
Is there any specific protocol to send data to the gateway and gateway to the node?
What is the specific requirement to be a node?

The “node” in a “node-gateway-network” connection operate under the LoRaWAN specification as administered by the LoRa Alliance. There is a great deal of information on the operation and certfication of LoRaWAN nodes/end-devices at the LoRa Alliance website: Homepage - LoRa Alliance® (lora-alliance.org)