Routing Protocol for low power and Lossy networks (RPL) is a standardized routing protocol for low power and lossy networks (LLNs) such as the Internet of Things (IoT). RPL was designed to be a simple (but efficient) and practical networking protocol to perform routing in IoT networks that consists of resource constrained devices. These tiny intercommunicating devices are currently in use in a large array of IoT application services (e.g., eHealth, smart agriculture, smart grids, and home automation). However, the lack of scalability and the low data communication reliability due to faulty links or malicious nodes, still remains significant challenges in the broader adoption of RPL in LLNs. In this paper, we propose RECOUP, a robust multicast communication routing protocol for Low power and Lossy Networks. RECOUP efficiently uses a low-overhead cluster-based multicast routing technique on top of the RPL protocol. RECOUP increases the probability of message delivery to the intended destination(s), irrespective of the network size and faults (such as broken links or non-responsive nodes), and in the presence of misbehaving nodes. An implementation of RECOUP is realized in Contiki. Our results show the effectiveness of RECOUP over state-of-art protocols concerning packet delivery ratio to 25%, end-to-end delay down to 100 ms, and low radio transmissions required for per packet delivery to 6 mJ. Moreover, it minimizes the impact of various topologies (i.e., rank and sybil) and data communication (i.e., blackhole, wormhole, and jamming) attacks that targets an IoT networking infrastructure.

低功耗有损网络（RPL）的路由协议是用于低功耗有损网络（LLN）的标准化路由协议，例如物联网（IoT）。RPL被设计为一种简单（但高效）且实用的网络协议，可在由资源受限设备组成的IoT网络中执行路由。这些微小的互通设备目前在大量的物联网应用服务中使用（例如，eHealth，智能农业，智能电网和家庭自动化）。但是，由于链路故障或恶意节点导致的可伸缩性不足和数据通信可靠性低，仍然在LLN中更广泛地采用RPL方面仍然是重大挑战。在本文中，我们提出了RECOUP，一种适用于低功耗和有损网络的健壮的多播通信路由协议。RECOUP在RPL协议之上有效地使用了一种低开销的基于集群的多播路由技术。无论网络规模和故障（例如断开的链路或无响应的节点）如何，以及存在异常节点的情况下，RECOUP都会增加将消息传递到预期目标的可能性。在Contiki中实现了RECOUP。我们的结果表明，RECOUP在最先进的协议上的有效性非常高，涉及的数据包传输率达到25％，端到端延迟低至100 ms，每个数据包传输所需的无线电传输低至6 mJ。而且，它可将各种拓扑（即等级和sybil）和数据通信（即黑洞，虫洞，