Network chatter generator

[Brandon Martin]

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.

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Brandon Martin