<p><b>@leandrolanzieri</b> approved this pull request.</p>

<p>Looks good. ACK.</p>
<details>
<summary><strong>Test result on Master</strong></summary>
<pre><code>> mac get txmode
2019-06-28 10:25:38,926 - INFO #  mac get txmode
2019-06-28 10:25:38,928 - INFO # TX mode: confirmable
> mac set txmode uncnf
2019-06-28 10:25:47,319 - INFO #  mac set txmode uncnf
2019-06-28 10:25:47,322 - INFO # Usage: mac set txmode <cnf|uncnf>
> mac get txmode
2019-06-28 10:26:00,556 - INFO #  mac get txmode
2019-06-28 10:26:00,558 - INFO # TX mode: confirmable
</code></pre>
</details>
<details>
<summary><strong>Test result with this PR</strong></summary>
<pre><code>> mac get txmode
2019-06-28 10:34:25,050 - INFO #  mac get txmode
2019-06-28 10:34:25,052 - INFO # TX mode: confirmable
> mac set txmode uncnf
2019-06-28 10:34:30,458 - INFO #  mac set txmode uncnf
> mac get txmode
2019-06-28 10:34:34,867 - INFO #  mac get txmode
2019-06-28 10:34:34,869 - INFO # TX mode: unconfirmable
</code></pre>
</details>

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