Well I can think of some solutions without knowing the capabilities of IOT 
devices.

1. Set up a filtering bridge between your WLAN and the WLAN that has the IOT 
devices.   In this way they are on the same logical network but not on the same 
physical network. You could  then set up a rule on the bridge to only forward 
traffic from your phone to the IOT network.

2. If the IOT devices can accept routing tables than you could let them know 
that there is a gateway router back to your phone's IP address. 

A lot of this gets easier if you use hard=coded IP addresses or IPv6  since 
than you can more easily build the correct rules into your bridge or router. 
Commercial ethernet switches used by offices can also have per a device rules 
on what specific items in the lan are allowed to reach. I haven't played with 
commercial networking equipment since wireless became so prevalent but physical 
network switches allowed the setup of VLAN or Virtual LAN to allow one physical 
network to behave more like two separate networks. I also believe a lot of the 
higher end home routers have Guest networks available in their default 
configuration. These would be a lot like the public WIFI in places like 
StarBucks and might be a way to go with the IOT. 

Hopefully I am not completely off base, since I have never study the network 
capabilities of IOT devices

                Best wishes,

Jonathan Cohn



> On Jan 26, 2018, at 7:27 PM, Agent086b <agent0...@internode.on.net> wrote:
> 
> Hi all,
> I wish to create another wireless network to run I O T devices as I don’t 
> want other things having access to my main network. I know how to do this and 
> have enough routers laying about for this purpose. Can I have my phone 
> connected to my mane network and some apps on that phone connected to my 
> second network. 
> Thanks as always for any advice.
> Max.
> 
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