Network chatter generator

Before I go to the trouble of making one myself, does anybody happen to know of a pre-canned program to generate realistic and scalable amounts of broadcast/broad-multicast network background "chatter" seen on typical consumer and business networks? This would be things like lots of ARP traffic to/from various sources/destinations within a subnet, SSDP, MDNS-SD, SMB browser traffic, DHCP requests, etc.? Ideally, said tool would have knobs to control the amount of traffic and whether a given type of traffic is present. This is mostly for torture testing "IoT" type devices by exposing them to lots of diverse, essentially nonsense traffic that they're likely to see in a real environment. -- Brandon Martin