enum Status {
    online
    offline
}
type Presence {
    id: ID!
    status: Status!
}
type Mutation {
    connect(id: ID!): Presence
    disconnect(id: ID!): Presence
}
type Query {
    heartbeat(id: ID!): Presence
    status(id: ID!): Presence
}
type Subscription {
    onStatus(id: ID!): Presence
        @aws_subscribe(mutations: ["connect","disconnect"])
}

type Mutation {
  connect(id: ID!): Presence
  disconnect(id: ID!): Presence
  disconnected(id: ID!): Presence
    @aws_iam
}
...
type Subscription {
  onStatus(id: ID!): Presence
    @aws_subscribe(mutations: ["connect","disconnect","disconnected"])
}