add support for CoAP ETag option

Description

When interacting with the coap.me server using:

I realize that this server seems to be using the OPTION_NUM_ETAG option, which the current CoAP client does not implement.

The purpose to this task is to implement OPTION_NUM_ETAG. A first test is to make sure the Python library can interact with the coap.me server.

The options also declared in CoapDefines.py as OPTION_NUM_ETAG, but needs to be implemented, probably at
https://github.com/openwsn-berkeley/coap/blob/develop/coap/coapOption.py#L177

Environment

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Assignee

Unassigned

Reporter

Thomas Watteyne

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Priority

Normal
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