How to configure broker address in mode WIFI_AP_STA about umqttbroker HOT 5 CLOSED

The ESP in WIFI_AP_STA mode has two IP addresses, one for the STA interface and one for the SOFT_AP.

The SOFT_AP interface is typically 192.168.4.1, the DHCP-server on the ESP distributes addresses in this subnet to its clients (in you case the temperature sensors).

The STA interface receives its address via DHCP from the uplink AP (Home Router). This should be different from 192.168.4.x (otherwise you have to change one of the networks).

The MQTT broker is accessible via both interfaces and IP addresses, i.e. your temperature sensors can connect their MQTT client to 192.168.4.1 port 1883. An external Android App has to connect to the address assigned by the home router. mDNS is not supported by Android as far as I know. But typicall the home routers remember their DHCP leases and use the same address every time. Another option would be to assign a static IP address to broker in the uplink network (outside the range of it DHCP server). Then you have well known fixed address there as well.

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Hello Martin, thanks for the fast reply.
For me is possible to connect to the broker only with STA IP address - othervise the temp sensor connects to AP(192.168.4.1) succesfully and get IP 192.168.4.2 but the MQTT broker connection failed -, rc=-2 (I use PubSubClient.h)
Seems like the broker is running only with STA IP address - otherwise I am doing something wrong.

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Hello,
I must manually configure the SOFT AP IP, Gateway and subnet and it starts working
Use WiFi.softAPConfig(local_ip, gateway, subnet); before starting soft AP.
Regards Jan

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