Multiple LoRa nodes collosion

I am afraid ist not the proper Forum.

I am taking data from a remote sensor via LoRa. I am receiving with a single channel Gateway. Then i am sending that data to node-red. Then into InfluxDB. Finally i am displaying it via Grafana.

  1. End node (Arduino UNO+LoRa Shield v1.4 + dht11)
  2. Gateway (Arduino UNO+LoRa Shield v1.4+Ethernet Shield)

I am using RadioHead library and PubSubClient library. I have multiple end nodes. My Question is how can i avoid the data collosion, if my end node transmit data at the very same time????

Thank you.

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