Update tradfri.markdown

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Azimoth 2018-07-08 20:25:18 +00:00 committed by GitHub
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@ -48,3 +48,6 @@ Do not use the `api_key` variable. The key is only needed once at initial setup.
Please make sure you have `autoconf` installed (`apt-get install autoconf`) if you want to use this component. Also, installing some dependencies might take considerable time (>1h) on slow devices. You might have to use `sudo` when installing `autoconf`.
</p>
## Troubleshooting
- Firmware updates: After updating the firmware of your Trådfri gateway it might be necessary to repeat the configuration process. If you encounter problems, delete `.tradfri_psk.conf`, restart Home Assistant, when prompted enter the security key and click configure, just like during initial setup. (Possible errors: ```Fatal DTLS error: code 115```)