[FS#1045] Support for special characters in ssids

[LEDE Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - sdx23 (sdx23) 

Attached to Project - LEDE Project
Summary - Support for special characters in ssids
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - //Device problem occurs on:// Possible all.
//Software versions of LEDE release, packages, etc.:// Tested with openwrt barrier breaker; relevant possibly to all versions.
//Steps to reproduce:// 
1. Set up a wireless network (master mode) with an essid containing special characters (e.g. "bäh") on some different device (probably not openwrt ;)
2. Use the openwrt device, try to connect to that wifi.
3. You won't have success...

Additional information:
wpa_supplicant supports ssids specified in hex-encoded form. To this there may not be any quotes around the ssid. I.e. in wpa_supplicant.conf it should look like ssid=62e468 instead of ssid="62e468". This quote free form is however not supported yet.

Workaround:
Right now it suffices to remove the quotes from the relevant line "ssid=..." in /lib/netifd/hostapd.sh - and afterwards specifying the hex-format ssid in /etc/config/wireless. It would be appreciated to have an alternate option, e.g. hexssid to enable for both possible ways.

(kind mention of stintel in #openwrt who pointed me to hostapd.sh)

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1045

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