lmsReceiverExample.js

import { LightningElement, track } from 'lwc';
import { MessageContext, subscribe } from 'lightning/messageService';
import ACCOUNT_SELECTED from './accountSelected.js';

export default class ReceiverComponent extends LightningElement {
    selectedRecordId;
    selectedRecord;

    connectedCallback() {
        subscribe(this.messageContext, ACCOUNT_SELECTED, this.handleSelectedAccount, { scope: APPLICATION_SCOPE });
        this.messageContext = MessageContext.getInstance();
    }

    handleSelectedAccount(message) {
        this.selectedRecordId = message.recordId;
        //fetch selected record with the id
    }
}