Multiple Client Pis

Developing Nodes
1

Hello everyone, I am new to Node-Red so need some of your help. I am trying to send data to multiple client raspberry Pis via Router from dashboard(server) side of main server raspberry pi. I need some of your guidance here.

2

Use MQTT.

Client PI 1 - subscribe to MQTT topic server/some/invented/topic
Client PI 2 - subscribe to MQTT topic server/some/invented/topic
Client PI 3 - subscribe to MQTT topic server/some/invented/topic

SERVER PI - Publish value to MQTT topic server/some/invented/topic

This is the simplest way.

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