@NonNull
    @Override
    public String toString() {
        return "Source address: " + Integer.toHexString(src) +
                "\nDestination address: " + Integer.toHexString(dst) +
                "\nPeriod Log: " + Integer.toHexString(periodLog) +
                "\nCount Log: " + Integer.toHexString(countLog) +
                "\nMin Hops: " + minHops +
                "\n Max Hops: " + maxHops;
    }
Heartbeat subscription.

@param src       Source address for Heartbeat messages.
@param dst       Destination address for Heartbeat messages.
@param periodLog Remaining period for processing Heartbeat messages.
@param countLog  Number of Heartbeat messages received.
@param minHops   Minimum hops when receiving Heartbeat messages.
@param maxHops   Maximum hops when receiving Heartbeat messages.
mesh/src/main/java/no/nordicsemi/android/mesh/utils/HeartbeatSubscription.java