It depends on the gateway specifications which is usually defined by the number of packets it can support.
For instance, if there is a 8-channel Gateway supporting 1.5M packets/day, and if the application sends 1 packet per hour, then more than 62,000 nodes can be handled by that Gateway.
Yes, it is possible for LoRa nodes to talk to each other. But changes need to be made to the LoRa stack for it. Hence, the system will not comply to LoRa specifications anymore.
Theoretically, mesh topology is possible. However, LoRa is defined for star-topology only.
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