Static IP address disappears after firmware update

[mrclmller]

Discussed in #636

^{Originally posted by mrclmller October 28, 2024}
I have a problem assigning a static IP address to glow. If I assign a static IP address as described in the ESPhome WiFi component documentation, I get an error message during installation stating that the manifest could not be reached due to a DNS failure.

relevant yaml-section

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Set up a wifi access point
  ap:
    ssid: '${friendly_name}'

  manual_ip:
    static_ip: 192.168.0.123
    gateway: 192.168.0.1
    subnet: 255.255.255.0

Below is the relevant installation log portion.
Apparently, no DNS server is assigned due to which the address for the manifest site cannot be resolved. In this case, I do not get the notification that version 4.2.3 is available in HA. The static IP address assigned works.

[12:58:21][C][wifi:428]:   Local MAC: XX:B6:1F:28:XX:XX
[12:58:21][C][wifi:433]:   SSID: [redacted]
[12:58:21][C][wifi:436]:   IP Address: 192.168.0.123
[12:58:21][C][wifi:440]:   BSSID: [redacted]
[12:58:21][C][wifi:441]:   Hostname: 'home-assistant-glow-28702c'
[12:58:21][C][wifi:443]:   Signal strength: -23 dB ▂▄▆█
[12:58:21][C][wifi:447]:   Channel: 9
[12:58:21][C][wifi:448]:   Subnet: 255.255.255.0
[12:58:21][C][wifi:449]:   Gateway: 192.168.0.1
[12:58:21][C][wifi:450]:   DNS1: 0.0.0.0
[12:58:21][C][wifi:451]:   DNS2: 0.0.0.0
[12:58:21][D][wifi:626]: Disabling AP...
[12:58:21][C][web_server:100]: Setting up web server...
[12:58:21][C][api:026]: Setting up Home Assistant API server...
[12:58:21][I][app:062]: setup() finished successfully!
[12:58:21][  8018][E][WiFiGeneric.cpp:1438] hostByName(): DNS Failed for glow-energy.io
[12:58:21][  8020][E][WiFiClientSecure.cpp:135] connect(): start_ssl_client: -1
[12:58:21][W][http_request.arduino:110]: HTTP Request failed; URL: https://glow-energy.io/home-assistant-glow/manifest.json; Error: connection refused
[12:58:21][E][component:164]: Component http_request set Error flag: unspecified
[12:58:21][E][component:164]: Component http_request.update set Error flag: Failed to fetch manifest from https://glow-energy.io/home-assistant-glow/manifest.json

If I add a DNS server to the manual IP definition, e.g. DNS1: 1.1.1.1, then the manifest is accessed and after installation, I get the notification of a firmware update to 4.2.3.The static address initially assigned still works.
After performing the update to 4.2.3, the static IP initially defined is disregarded and a different IP address is assigned through DHCP.

Am I misunderstanding how to define the static IP, or is there something else I am not aware of?

It could be that something gets overwritten with the firmware update as Klaas mentions, however, I have no idea where to look further.

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