Assumption

• RPI_A
  • MM IP : 192.168.178.101:8080
  • PIR_SENSOR is installed
  • This will emit notification "USER_PRESENCE" with payload true/false
• RPI_B
  • MM IP : 192.168.178.102:8080
  • PIR_SENSOR IS not installed.
  • It needs payload value of USER_PRESENCE from RPI_A

RPI_A MMM-NotificationTrigger config

{
  module: "MMM-NotificationTrigger",
  config: {
    triggers: [
      {
        trigger: "USER_PRESENCE",
        triggerPayloadFilter: (payload) => {
          return payload
        },
        fires: [
          {
            fire: "DUMMY_NOTIFICATION",
            exec: `curl -d "notification=RELAYED_USER_PRESENCE&payload=true" http://192.168.178.102:8080/webhook`
          }
        ]
      },
      {
        trigger: "USER_PRESENCE",
        triggerPayloadFilter: (payload) => {
          return !payload
        },
        fires: [
          {
            fire: "DUMMY_NOTIFICATION",
            exec: `curl -d "notification=RELAYED_USER_PRESENCE&payload=false" http://192.168.178.102:8080/webhook`
          }
        ]
      },
    ]
  }
},

If USER_PRESENCE notification is emitted from MMM-PIR-Sensor, it will be translated to DUMMY_NOTIFICATION and curl shell command will be executed to transfer message(RELAYED_USER_PRESENCE) to RPI_B

RPI_B MMM-NotificationTrigger config

{
  module: "MMM-NotificationTrigger",
  config: {
    useWebhook: true,
    triggers: [
      {
        trigger: "RELAYED_USER_PRESENCE",
        fires: [
          {
            fire: "DOING_MY_JOB",
            payload: (payload) => {
              return (payload == "true") ?  true : false
            }
          }
        ]
      }
    ]
  }
},

By useWebhook:true it can listen message from RPI_A. When RELAYED_USER_PRESENCE is coming, DOING_MY_JOB (or whatever you want) notification will be emitted on RPI_B

• MMM-PIR-Sensor (RPI(A)) : You can modify socektNotificationReceived() to emit your custom notification,
  Or send HTTPRequest directly to RPI(B)
• MMM-NotificationTrigger (RPI(A)) : Or you can translate notification from MMM-PIR-Sensor to your custom notification for further relayed module,
  Or you can execute directly external shell command/internal javascript for sending HTTPRequest when notification is coming from MMM-PIR-Sensor
• Or … you can build your own module for this job.

• MMM-Remote-Controller (RPI(B)) : You can get HTTPRequest from RPI(A) to do something
• MMM-NotificationTrigger(RPI(B)) : This module also can catch HTTPRequest and do something
• Or … you can build your module for this job.

• Or you can make scripts with javascript or python or any other language to communicate between two RPIs. It will be not so difficult to expert, but…

all u need is the signal pin of the PIR… and connect the grounds together on the two PI devices…

otherwise you could have one PI send a MMM message to the other to wakeup…

I have 2 Magic.Mirrors in a mirror and just wanted to use 1 PIR module for both.

Therefore the question if this is technically possible or if I have to use a module for each raspberry.