How about an inexpensive IP-addressable device built specifically to generate traffic for bandwidth testing? Power it directly from the wall (rather than UPS) and it would double as a power-failure monitor. “RB710”?
as i see it - every RouterOS router can generate traffic using well, /tool traffic-generator and every windows and linux host with wine can have dude installed to monitor network, network devices and servers.
Every routerboard can generate traffic–but you don’t want to generate traffic using the same board that the link is running on, right? I’m talking about a separate device that you would leave installed on-site.
As for monitoring the network: with all critical equipment on UPS, Dude will not tell us when the wall power is down, unless we are monitoring something that is -not- powered through the UPS. An IP-addressable, non-critical component that is powered directly from the wall, would serve that purpose. And a dedicated, inexpensive traffic-generator device would fit that bill.
The least-expensive solution using existing Routerboard products would be an RB411L (L3 license, no radio), list price $39, plus a case, or find room for it in an existing enclosure. I was thinking something along the lines of a Groove: no radio, integral indoor/outdoor case, cost-reduced so that we could include one in every install.
i’d go with RB951-2n it casts 5.05$ more than rb411L but for that you get 2.4GHz wireless that is N capable and a case. Use it to monitor wireless spectrum to select best channel, monitor power on wall socket (if it is down) and generate traffic.
And in the end can be used as backup unit to provide wireless in premises 
Or the RB750: both fine if the equipment is inside or you can find room in an outdoor enclosure. But I’m looking toward a $20-30 price point, not $40-50, because this would be coming right out of the equipment budget of every installation. How much cost can you take out of that $40 RB750, by removing ether2-5 and putting it in a shortened Groove case?