syntax = "proto3";
package com.fundamentum.edge.v1;

// Quality of Service (QoS) levels
enum Qos {
    // This level guarantees that the message is delivered at most once. 
    // This is also known as "fire and forget" and it provides the same 
    // guarantee as the underlying TCP protocol.
    QOS_AT_MOST_ONCE = 0;
    // This level guarantees that the message is delivered at least once. 
    // If the sender doesn't receive an acknowledgement, it will resend 
    // the message.
    QOS_AT_LEAST_ONCE = 1;
    // This level guarantees that the message is delivered exactly once. 
    // This is the safest but slowest QoS level.
    QOS_EXACTLY_ONCE = 2;
}