I'll defer to you an insider on the hardware efforts, but the timing of the Motorola acquisition in the immediate aftermath of Google's failed bid[1] on Nortel's patent portfolio made it seem more like a patent-play more than a hardware acquisition. I recall Motorola's then-CEO even threatened to sue Google over patent Android infringement just before the acquisition, so it most certainly wasn't just about building a hardware business.
1. It was a crazy time. The winning consortium - which included Apple and Microsoft - invited Google to join their $4.5B bid; which would have made the patents entirely useless as a defense of Google against Apple or Microsoft. Google wisely declined, but bought Motorola less than a year later for $12B. https://www.theguardian.com/technology/2011/jul/02/google-pi...
1. It was a crazy time. The winning consortium - which included Apple and Microsoft - invited Google to join their $4.5B bid; which would have made the patents entirely useless as a defense of Google against Apple or Microsoft. Google wisely declined, but bought Motorola less than a year later for $12B. https://www.theguardian.com/technology/2011/jul/02/google-pi...