After you upload the firmware to your ESP32 can you make modifications to secrets.yaml?

ESPHome
1

HI,

Reasonably new to ESPHome and have flashed two ESP32 units when the devices were connected to a Guest Network using the main networks subnet (192.168.9.x)

I have now added an IoT VLAN (Asus Router) with a different subnet for IoT devices than the primary subnet.

My previous secrets.yaml looks like this:

# Your Wi-Fi SSID and Password
wifi_ssid: "xxxxxxxx"
wifi_password: "pppppppp"
gateway: 192.168.9.1
subnet: 255.255.255.0
wifi_ap_password: "apapapapapapap"
encryption_key: "lotsof hieropglyphics"
ota_password: "moremenainglessnumbers"

As title, the question is simply after you upload the firmware can you make modifications to secrets.yaml that will allow you to change these details (i.e. does the firmware ā€˜referenceā€™ secrets.yaml) or does the information in secrets.yaml get hard coded into the firmware binary?

If the former, all other SSID and PWDs being the same for the new IoT Subnet then would I be correct that I should be able to simply change gateway: 192.168.9.1 to gateway: 192.168.53.1 (the new subnet is 53); and if the latter I will need to change secrets.yaml to the IoT VLAN gateway (is that correct?) and redo the ā€œInstallā€.

thank you!

k.

2

No - these are part of the compiled code. If you change them, you need to compile again.

3

Thank you, much appreciated.

Assuming the Router assigns IP Addresses via DHCP for the IoT Network, am I correct that the revised Gateway in the secrets.yaml for my case is 192.168.53.1?

4

Or leave out the gateway - DHCP should supply that as well. It should only be needed if you have static IP addresses in your yaml.

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