Controlling Sonos players without WiFi.

Your phone can't act as a hotspot and control Sonos at the same time.

Have you (1) been plugging the PLAY:5 and NAS into a wired network at work, or (2) simply wiring the NAS directly to the P:5 and not connecting to any network (standalone mode)?

Either way, you'll need to configure your phone to connect to SonosNet. Do this at home, via Advanced Settings in the controller. A new SSID entry will appear in your phone's WiFi settings. Connect to it and test it out.

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For option (1) above, just take P:5, NAS and phone to work. Connect to the SonosNet SSID and you're done.

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For option (2) it gets a bit more complicated, but with a small tweak the Android phone can connect to the PLAY:5 whilst that's standalone. What you'll need to do is:
- edit the network settings for the SonosNet SSID on the phone
- specify a static IP address of 169.254.1.1 with a network prefix length of 16
- ignore the gateway and DNS items, but if it demands entries put 169.254.1.1 as the gateway and 8.8.8.8 as DNS

When the PLAY:5 is standalone at work your phone should now connect to the SonosNet SSID.

Note that the SonosNet SSID now won't work back at home, since the IP won't match your home network. You'll need to connect to your router's WiFi as you currently do.

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If you want to undo all of this and start over, just disable the SonosNet connection in Advanced Settings.