This implements the forwarding of the additional gateway metrics implemented by ChirpStack Gateway Bridge v3.13.0 to the ChirpStack Application Server.
AS923_4band (AS923 with -5.90 MHz frequency offset).
- Docker images added for ARM v6, v7 and ARM64. (#546)
- Remove sending mac-commands in Class-C downlink. (#543)
- Fix AS923 sub-bands (_2 and _3) in