I am using the Sonoff-Tasmota firmware to configure ESP-8266 devices for my home automation system. These devices log onto the WiFi network and obtain IP addresses via DHCP. The problem is that after they come up on the network they are not accessible to the web browser using their hostname.
I have other devices (like Raspberry Pi and windows PC's) that also use WiFi and DHCP and they can be accessed using their hostnames, so I think the router is working ok.
I have traced the DHCP dialog using Wireshark and I can see the hostname in the request, so I don't know what else to do. Any ideas?