[riot-notifications] [RIOT-OS/RIOT] drivers/rn2xx3: fix incorrectly terminated hex strings when writing an array of bytes (#11658)

Alexandre Abadie notifications at github.com
Fri Jun 7 10:46:43 CEST 2019

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### Contribution description

Fixes #11499

This PR provides the proposed fix in #11499 because I think it makes sense and is safer. I did a couple of tests and couldn't find any issue.

The PR is also adding a debug statement for tracking what's being sent to the module.

Note that I couldn't reproduce the issue described in #11499 because I'm testing on arduino-zero and the toolchain used in #11499 is also known to have issues (arm gcc 4.9).

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### Testing procedure

Run tests/drivers_rn2xx3 and set set a network or application session key:
> mac set nwkskey AABBCCDDEEFF0011AABBCCDDEEFF0011
It should work (no error message displayed).

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output

### Issues/PRs references

Fixes #11499

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

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-- Commit Summary --

  * drivers/rn2xx3: fix incorrectly terminated hex strings

-- File Changes --

    M drivers/rn2xx3/rn2xx3_internal.c (3)

-- Patch Links --


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