[riot-notifications] [RIOT-OS/RIOT] examples/gcoap: add support for socket ZEP (#16472)

benpicco notifications at github.com
Fri May 14 14:56:50 CEST 2021

### Contribution description

To simulate gcoap on a 802.15.4 node we can use the `socket_zep` network interface for `native`.
This adds a convenient make variable to enable this with a single command line option.

### Testing procedure

 - create tap interface

        sudo dist/tools/tapsetup/tapsetup

  - start ZEP border router

        make -C examples/gnrc_border_router BOARD=native all term

 - run gcoap example with a simulated 802.15.4 interface with custom MAC address
        make -C examples/gcoap BOARD=native USE_ZEP=1 ZEP_MAC=\"E6:CB:21:BF:9B:F8:72:62\" all term

main(): This is RIOT! (Version: 2021.07-devel-225-gc21097)
gcoap example app
All up, running the shell now
> ifconfig
Iface  7  HWaddr: 72:62  Channel: 26  NID: 0x23 
          Long HWaddr: E6:CB:21:BF:9B:F8:72:62 
          L2-PDU:102  MTU:1280  HL:64  6LO  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::e4cb:21bf:9bf8:7262  scope: link  VAL
          inet6 addr: 2001:db8::e4cb:21bf:9bf8:7262  scope: global  VAL
          inet6 group: ff02::1

### Issues/PRs references

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * examples/gcoap: add support for socket ZEP

-- File Changes --

    M examples/gcoap/Makefile (15)

-- Patch Links --


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