dune-weaver/wifi/dnsmasq-hotspot.conf

# Dune Weaver - DNS redirect for captive portal detection
#
# Used in hotspot mode only. Redirects ALL DNS queries to the Pi
# so that phones/tablets trigger captive portal detection and
# open the Dune Weaver app automatically.
#
# iOS checks: captive.apple.com
# Android checks: connectivitycheck.gstatic.com
# Windows checks: www.msftconnecttest.com
#
# By responding with the Pi's IP for all queries, the OS detects
# a "captive portal" and opens its built-in browser to the Pi.

# Respond to all DNS queries with the hotspot IP
address=/#/10.42.0.1

# Don't use upstream DNS servers (we want ALL queries to resolve to us)
no-resolv

# Don't read /etc/hosts
no-hosts

# Only handle DNS (port 53), not DHCP (NetworkManager handles DHCP)
no-dhcp-interface=wlan0
port=53