RPI 1 512 wifi setting.

[br1dipaolo]

Typically when a Router does not assign an IP address to a WiFi client :

1. The client attempted to associate with the Router but was rejected. This is usually because of a bad password.
2. The client successfully associated but the Router DHCP server and the client failed to negotiate an IP address. This can be due to the negotiation timing out for some reason.
3. The client never attempted to associate with the Router. This can be due to a bad SSID on the client.

Your best bet os to examine the Router WiFi and DHCP logs to see of there are messages relating to the client.

Thanks Tim I will review the logs you indicated. one last detail: in the network config, under the Address assignment window of the Wireless section, I find written "unable to activate ap mode".