First the config file is only for configuration and not for script , so you dnsmasq is totally wrong
this is what your dnsmasq.conf.add and not dnsmasq.conf
interface=br1
dhcp-range=tag:br1,192.168.2.100,192.168.2.150,255.255.255.0,1440m
dhcp-option=tag:br1,3,192.168.2.1
now your...