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Software-defined networking (SDN) is a new emerging technology for networking that separates the forwarding and control plane. With SDN static, inflexible and complex network are replaced by dynamic, scalable, and innovative networks. The motivation of developing low-cost portable SDN switch arose when we were developing load balancing and stateful firewall SDN applications during our research work. To test and measure the performance of our applications, we needed low-cost SDN testbed. Existing solutions were utilizing special hardware such as NetFPGA or real switches. But these were not suitable due to high costs and complexity involved. We could have tested these applications using Mininet emulator but there are performance issues. In this paper, we created a small size, low cost, portable SDN switch for testing our SDN applications using Raspberry Pi. Our low-cost switch supports …