fix: sending error responses (align with esptool)

[jedi7]

Description

Make the sending of error responses to be compatible with the esptool.

Related

Testing

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[jedi7]

@Dzarda7 can you please look?

[Dzarda7]

@jedi7 can we just have uint16_t for the error and remove the esp_response?

[jedi7]

@Dzarda7 I wanted to do it that way, but not sure if this approach will be ok also for success responses. We can discuss that.

[Dzarda7]

I believe so, we can use just 0 for success right?

[jedi7]

@Dzarda7 updated ;-)

[Dzarda7]

I thought you were against using typedefs here, but no issue. LGTM, thanks for the fix.

[jedi7]

I thought you were against using typedefs here, but no issue. LGTM, thanks for the fix.

that was somebody else :)