Unencrypted RS41-SGM Support

This release adds:

• Support for unencrypted Vaisala RS41-SGM radiosondes, thanks to some excellent work by @rs1729. These sondes have a slightly different telemetry format to regular RS41-SG sondes.
• Support for RS41 battery voltage. This is currently only saved to the log file, though may be brought out to the web interface on the next release.

Other changes include:

• Default Horus UDP output port changed to 55673, and is enabled by default. Chasemapper has been updated to include this output as a default profile.
• The decoder spacing minimum limit has been set to a minimum of 15 kHz for all radiosonde types. Please let me know if you regularly observe radiosondes on adjacent (10kHz) channels, so I can revise this restriction if necessary.

Please report any problems encountered either on the mailing list, or by raising an issue on this repository.

PLEASE DO NOT USE THE GITHUB GENERATED RELEASE ZIP FILES - USE THE INSTALLATION/UPDATE STEPS DESCRIBED IN THE WIKI

APRS Station Position Fixes, Experimental Demod filter improvements

A few small fixes, including:

• Improved channel filtering for the experimental demodulation chains.
• Updated to the latest DFM decoder.
• Changed APRS station position uploading to use position reports instead of objects. If you want to show up on radiosondy.info, then you will also need to set
  station_beacon_icon = /`
• Added a 'station' field to the Payload Summary UDP output packet (uses the habitat station callsign value), to allow recording of where a payload summary packet originated from in client applications.
• Some other changes in preparation for handling of unencrypted RS41-SGM sondes.

Please report any problems encountered either on the mailing list, or by raising an issue on this repository.

PLEASE DO NOT USE THE GITHUB GENERATED RELEASE ZIP FILES - USE THE INSTALLATION/UPDATE STEPS DESCRIBED IN THE WIKI

New experimental demodulation chain, many other updates.

Note: There is now a slightly updated v1.1.1 release.

• Add 'experimental' demodulation chains, which use David Rowe's FSK Demodulator to enable better tracking of drifty sondes (DFMs mainly). Refer to this tech-note for details.
• Handle detection of sondes on adjacent 10kHz channels, caused by sondes that drift up/down considerably (i.e. DFMs..). This is best paired with the experimental DFM demodulation chain.
• Add a high-pass filter option for the 'regular' RS41 decoder, to better handle frequency offsets (up to ~2 kHz without significant degradation). For more details refer to this tech-note.
• Add SMTP-SSL support for e-mail notifications.
• A few small tweaks to the web interface (fixes #171 and #155).
• Fix the encoding of high-precision APRS positions.
• Fix a bug which occurred when a RS41-SGM sonde was received.
• Remove un-used directories from the upstream RS repo.

A large number of options have been added to the station.cfg file, so it is recommended that you make a new copy of the example file and edit as appropriate.

Please report any problems encountered either on the mailing list, or by raising an issue on this repository.

PLEASE DO NOT USE THE GITHUB GENERATED RELEASE ZIP FILES - USE THE INSTALLATION/UPDATE STEPS DESCRIBED IN THE WIKI

Fix RS41 burst timer reversion.

• Re-adds the RS41 burst timer output from rs41mod, which was accidentally reverted when updating the demodulators.

Please report any problems encountered either on the mailing list, or by raising an issue on this repository.

PLEASE DO NOT USE THE GITHUB GENERATED RELEASE ZIP FILES - USE THE INSTALLATION/UPDATE STEPS DESCRIBED IN THE WIKI

Decoder Updates, Vaisala RS41 Humidity Support

Updates include:

• Update the sonde decoders to the new 'modular' decoders from rs1729's repository - Thanks to Zilog80 for these updates:
  • Preliminary Relative Humidity calculation for Vaisala RS41 sondes.
  • Reporting of encrypted RS41 telemetry. If encrypted telemetry is observed, auto_rx will immediately terminate that decoder with an error and go back to scanning.
  • Fix use of SEM Almanac for RS92s post the GPS week rollover.
• Add a temporary block-list function, which will block the frequency of a RS41-SGM for ~60 minutes. This will help avoid continuous detection and lock-on to an encrypted radiosonde. A new setting has been added to the configuration file ([advanced] -> temporary_block_time) which specified the block time.

Please report any problems encountered either on the mailing list, or by raising an issue on this repository.

PLEASE DO NOT USE THE GITHUB GENERATED RELEASE ZIP FILES - USE THE INSTALLATION/UPDATE STEPS DESCRIBED IN THE WIKI

Initial iMet-4 support

• Switched to the semantic versioning approach for version numbers.
• Added initial Intermet iMet-4 support. The narrowband iMet-1 sondes should also work. This has not been tested with 'in the wild' sondes, only on the bench, so please let us know how you go! Refer to the Model Specific Notes wiki page for information on issues with decoding iMet sondes.
• Added additional config file options - users will need to re-generate their configuration file from station.cfg.example.
• Added debug output options - the FM-demodulated audio for the detection and decode steps can be saved to disk - Note that this may use up a lot of disk space, and should only be enabled if absolutely necessary.

PLEASE DO NOT USE THE GITHUB GENERATED RELEASE ZIP FILES - USE THE INSTALLATION/UPDATE STEPS DESCRIBED IN THE WIKI