Shelly 1 plus con node red

[E1cid]

This link may help Shellyplus1 (gen2) Nodered to MQTT - #4 by E1cid
There are some setting you may have to enable

enabling enable mqtt control will allow these commands also

In addition to the MQTT RPC channel, some functional components export a control interface which allows for easier integration with external systems, in cases where a complete RPC client on the peer is not feasible or practical. Publish and subscribe topics are defined which allow direct control of the device over MQTT. They are available when the enable_control flag in the MQTT configuration is set to true. For components which support mqtt control, the common topic pattern is:

• Shelly will subscribe to the following topics, accepting commands:
  • shellies/command which can be used to send a "broadcast" command to all devices on this MQTT exchange
  • <topic_prefix>/command where <topic_prefix> is usually unique per device
  • <topic_prefix>/command/<component:id> where individual components accept specific commands