recent changes + additions #13
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outsourced font stuff into font.h; introduced TOPICROOT (default: "ledMatrix"); device now has a unique name derived from serial no. part of MAC address, used for individual subscriptions and for publishing status messages; more robust text display (skip undefined glyphs)
user may set `do_publishes` constant to false in local configuration file to prevent device from publishing anything to the MQTT broker
add support for multi-channel text incl. channel selection; add bullet (•) to font; configurable topic names (via TOPICROOT)
fixed text buffer problem; OTA updates; logging via telnet (port 22);
Show name and device number on startup
show / log / publish version number at startup
added Node-RED example flow
negative delay determines time to show each channel when not scrolling; case-insensitive subscribed topics; cut off logged text buffers to prevent display stuttering
some additions to Readme.md
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