AREDN® Release v3.21.4.0 is Available

• Fix spike to zero in SNR Chart #90 (ab7pa)
• Execute Button Description #86 (ab7pa)
• Add Rocket XM ar71xx image to support older models with USB port #83 (ae6xe)
• Fix tunnel server clients accidentally limited to 9 #82 (pmilazzo)
• Add “none” type advanced config options to simplify the UI #81 (dman776)
• Update banner #80 (dman776)
• update login banner #79 (dman776)
• Add mesh gateway setting to sysinfo.json #77 (dman776)
• Add advanced config option to purge AREDN Alert msgs #76 (dman776)
• Update alert banner background color #72 (ab7pa)
• Reset download paths upon upgrade to default #69 (dman776)
• Upgrade to openwrt 19.07.7 #68 (ae6xe)
• Add new Mikrotik model string for SXTsq5nD #62 (ae6xe)