On flow - multiple access

hi, i have a flow as show it, is a retransmision Lora messages schema. This flow no have GUI. i wanna know what happen if other flows access to this at the same time or while the schema is running? has nodered multi thread or queue the access?

Sorry, not really clear what you mean. Do you mean that more than one source can use the link from the RX_Gateway or Message to Send links?

If so, that is usually OK even though Node-RED is essentially a single threaded app. The Node.JS loop allows apps to seem like they are multi-threaded even though they are not.

Adding some more debug nodes after the delay nodes will help you see exactly what goes on and in what order.