/*
* Network Service Type for option SO_NET_SERVICE_TYPE
*
* The vast majority of sockets should use Best Effort that is the default
* Network Service Type. Other Network Service Types have to be used only if
* the traffic actually matches the description of the Network Service Type.
*
* Network Service Types do not represent priorities but rather describe
* different categories of delay, jitter and loss parameters.
* Those parameters may influence protocols from layer 4 protocols like TCP
* to layer 2 protocols like Wi-Fi. The Network Service Type can determine
* how the traffic is queued and scheduled by the host networking stack and
* by other entities on the network like switches and routers. For example
* for Wi-Fi, the Network Service Type can select the marking of the
* layer 2 packet with the appropriate WMM Access Category.
*
* There is no point in attempting to game the system and use
* a Network Service Type that does not correspond to the actual
* traffic characteristic but one that seems to have a higher precedence.
* The reason is that for service classes that have lower tolerance
* for delay and jitter, the queues size is lower than for service
* classes that are more tolerant to delay and jitter.
*
* For example using a voice service type for bulk data transfer will lead
* to disastrous results as soon as congestion happens because the voice
* queue overflows and packets get dropped. This is not only bad for the bulk
* data transfer but it is also bad for VoIP apps that legitimately are using
* the voice  service type.
*
* The characteristics of the Network Service Types are based on the service
* classes defined in RFC 4594 "Configuration Guidelines for DiffServ Service
* Classes"
*
* When system detects the outgoing interface belongs to a DiffServ domain
* that follows the recommendation of the IETF draft "Guidelines for DiffServ to
* IEEE 802.11 Mapping", the packet will marked at layer 3 with a DSCP value
* that corresponds to Network Service Type.
*
* NET_SERVICE_TYPE_BE
*             "Best Effort", unclassified/standard.  This is the default service
*             class and cover the majority of the traffic.
*
* NET_SERVICE_TYPE_BK
*             "Background", high delay tolerant, loss tolerant. elastic flow,
*             variable size & long-lived. E.g: non-interactive network bulk transfer
*             like synching or backup.
*
* NET_SERVICE_TYPE_RD
*             "Responsive Data", a notch higher than "Best Effort", medium delay
*             tolerant, elastic & inelastic flow, bursty, long-lived. E.g. email,
*             instant messaging, for which there is a sense of interactivity and
*             urgency (user waiting for output).
*
* NET_SERVICE_TYPE_OAM
*             "Operations, Administration, and Management", medium delay tolerant,
*             low-medium loss tolerant, elastic & inelastic flows, variable size.
*             E.g. VPN tunnels.
*
* NET_SERVICE_TYPE_AV
*             "Multimedia Audio/Video Streaming", medium delay tolerant, low-medium
*             loss tolerant, elastic flow, constant packet interval, variable rate
*             and size. E.g. video and audio playback with buffering.
*
* NET_SERVICE_TYPE_RV
*             "Responsive Multimedia Audio/Video", low delay tolerant, low-medium
*             loss tolerant, elastic flow, variable packet interval, rate and size.
*             E.g. screen sharing.
*
* NET_SERVICE_TYPE_VI
*             "Interactive Video", low delay tolerant, low-medium loss tolerant,
*             elastic flow, constant packet interval, variable rate & size. E.g.
*             video telephony.
*
* NET_SERVICE_TYPE_SIG
*             "Signaling", low delay tolerant, low loss tolerant, inelastic flow,
*             jitter tolerant, rate is bursty but short, variable size. E.g. SIP.
*
* NET_SERVICE_TYPE_VO
*             "Interactive Voice", very low delay tolerant, very low loss tolerant,
*             inelastic flow, constant packet rate, somewhat fixed size.
*             E.g. VoIP.
*/

$ git clone https://github.com/CiscoDevNet/fastlane-udp-client-app.git

// Choose from one the following service types
// Hint: For the UDP Client here it will be NET_SERVICE_TYPE_RD
//

/*
* NET_SERVICE_TYPE_BE
* NET_SERVICE_TYPE_BK
* NET_SERVICE_TYPE_VI
* NET_SERVICE_TYPE_VO
* NET_SERVICE_TYPE_RV
* NET_SERVICE_TYPE_AV
* NET_SERVICE_TYPE_OAM
* NET_SERVICE_TYPE_RD
* /

optval = NET_SERVICE_TYPE_BE; /* default */
         optlen = sizeof(optval);
        if(setsockopt(socketFD, SOL_SOCKET, SO_NET_SERVICE_TYPE, &optval, optlen) < 0) {
            perror("setsockopt()");
        }