LittleBitsSubscriber.cls

//Anonymous APEX REST Service that you can subscribe to with LittleBits Cloudbit
@RestResource(urlMapping='/subscriber')
global with sharing class LittleBitsSubscriber 
{
    @HttpPost
    global static String processSubscriptionEvent()
    {
        String requestBody = RestContext.request.requestBody.toString();
        system.debug(requestBody);
        Map<String, Object> littleBitsdata = (Map<String, Object>) JSON.deserializeUntyped(requestBody);
        LittleBit_Feedback__c bitsFeedback = new LittleBit_Feedback__c(Location__c =littleBitsdata.get('bit_id'), Description__c =String.valueof(littleBitsdata));
        insert bitsFeedback;
        return 'Success';
    }
}