`wifi.dhcp` throws an error

[jingman]

> wifi.dhcp
>>= AT+NDHCP=1
<<= 15
Error: saving WifiModule::instance.bp()->configuration data failed
> 

[jingman]

Rebooting made this go away, but I saw it happen when I was provisioning via HQ as well.

[quartzjer]

Should be re-tested after recent gainspan/SPI updates

[matthijskooijman]

I don't think the SPI transaction stuff should make a difference here, the Gainspan module is simply returning an error.

The code 15 means "S2W_ENOIP IP configuration has failed. This message also can come asynchronously when there is a DHCP renew fails.". I think that this case is not an asynchronous message, which have a different header and are handled somewhere else. Not sure why simply enabling DHCP can cause a failure. Perhaps it starts DHCP immediately if already associated?

[matthijskooijman]

Looking at the gainspan firmware source, it actually reconfigure the network when you do wifi.dhcp when still associated (IIRC I previously tested this and it didn't happen, but the code seems to at least do _something _ after saving the config). Perhaps HQ should just do wifi.disassociate before changing the config?