Platform Events in Aura Component Salesforce

public class PlatformEventCtrl {
     
    public static void publishEvent(){
        Techdicer_Event__e event = new Techdicer_Event__e();
        event.message__c = 'test';
        event.recordId__c = '0016F000041zsTDQAY';
        event.status__c = 'Success';
        EventBus.publish(event);
    }
}

<aura:component  implements="flexipage:availableForAllPageTypes" access="global" >
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    <aura:attribute name="status" type="String" />
    <aura:attribute name="message" type="String" />
    <aura:attribute name="recordId" type="String" />
    
    <lightning:empApi aura:id="empApi" />
    <lightning:card title="Platform Events in Aura Component Salesforce" iconName="standard:account">
        <div class="slds-p-horizontal_small">
            <p>Status : {!v.status}</p>
            <p>Message : {!v.message}</p>
            <p>Record Id : {!v.recordId}</p>
        </div>
    </lightning:card>
</aura:component>

({
	doInit : function(component, event, helper) {
        var channel = '/event/Techdicer_Event__e';
        const replayId = -1;
         
        const empApi = component.find("empApi");
         
        //A callback function that's invoked for every event received
        const callback = function (message) {
            var obj = message.data.payload;
            console.log(obj);
            
            component.set("v.status", obj.Status__c);
            component.set("v.message", obj.message__c);
            component.set("v.recordId", obj.recordId__c);
             
            //fire toast message
            var toastEvent = $A.get("e.force:showToast");
            toastEvent.setParams({
                "mode" : 'sticky',
                "title" : "Success",
                "message" : obj.message__c,
                "type" : "success"
            });
            toastEvent.fire();
        };
        
        // Subscribe to the channel and save the returned subscription object.
        empApi.subscribe(channel, replayId, callback).then(function(newSubscription) {
            //console.log("Subscribed to channel 1" + channel);
        });
        
        const errorHandler = function (message) {
            console.error("Received error ", JSON.stringify(message));
        };
        
        //A callback function that's called when an error response is received from the server for the handshake, connect, subscribe, and unsubscribe meta channels.
        empApi.onError(errorHandler);
    }
})