[riot-notifications] [RIOT-OS/RIOT] examples/lorawan: fix semtech_loramac_send TX ret code (#11869)

Francisco notifications at github.com
Fri Jul 19 12:23:44 CEST 2019


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### Contribution description

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With #11541 (b7890b3031a653bde2d33afb54b9aa819e29af53) TX notification messages are only sent after mcps confirm event, and the code sent is `SEMTECH_LORAMAC_TX_DONE` instead of `SEMTECH_LORAMAC_TX_OK`. This PR fixes the documentation and the example accordingly.


### Testing procedure

Compile and flash `examples/lorawan` with valid keys:

`make BOARD=b-l072z-lrwan1 DEVEUI=00BD35DEE58FF9CB APPEUI=70B3D57ED000B02F APPKEY=C91870835C73F5E36EDF6E5DBD1445D0 -C examples/lorawan flash term`

Without this PR TX actually succeeds but SEMTECH_LORAMAC_TX_DONE return value is perceived as error:

```
2019-07-19 11:54:38,531 - INFO # nding: This is Rmain(): This is RIOT! (Version: 2019.10-devel-71-ga9e72c5-pr_lorawan_retcode)
2019-07-19 11:54:38,535 - INFO # LoRaWAN Class A low-power application
2019-07-19 11:54:38,538 - INFO # =====================================
2019-07-19 11:54:38,604 - INFO # Starting join procedure
2019-07-19 11:54:43,784 - INFO # Join procedure succeeded
2019-07-19 11:54:43,786 - INFO # Sending: This is RIOT!
2019-07-19 11:54:44,902 - INFO # Cannot send message 'This is RIOT!', ret code: 6
```

With this PR everything is OK.

```
2019-07-19 11:52:59,595 - INFO # main(): This is RIOT! (Version: 2019.10-devel-71-ga9e72c5-pr_lorawan_retcode)
2019-07-19 11:52:59,599 - INFO # LoRaWAN Class A low-power application
2019-07-19 11:52:59,602 - INFO # =====================================
2019-07-19 11:52:59,668 - INFO # Starting join procedure
2019-07-19 11:53:04,849 - INFO # Join procedure succeeded
2019-07-19 11:53:04,852 - INFO # Sending: This is RIOT!
2019-07-19 11:53:25,966 - INFO # Sending: This is RIOT!
```

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11869

-- Commit Summary --

  * examples/lorawan: fix semtech_loramac_send TX ret code

-- File Changes --

    M examples/lorawan/main.c (2)
    M pkg/semtech-loramac/doc.txt (2)
    M pkg/semtech-loramac/include/semtech_loramac.h (4)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11869.patch
https://github.com/RIOT-OS/RIOT/pull/11869.diff

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