I wrote software but the company I worked for manufactured a small computer to monitor power for buildings. It had wifi and such. We used a "contract manufact

I wrote software but the company I worked for manufactured a small computer to monitor power for buildings. It had wifi and such. We used a "contract manufacturer". The company was called Agility in NH (USA). They worked out ok, they would get the components, build, test and ship out to customers (Direct Fulfillment). We had to order components, though they stored them. I think its more expensive than overseas manufacturing but the fact they were close was helpful.