Lora-modem

This is a minor release that contains some bug fixes and adds AT commands for device certification.

**Bug fixes**

- Make the companion Python library compatible with older Python versions;
- Fix a bug in the handling of confirmed uplinks;
- Fix the restoration of DevEUI and AppEUI/JoinEUI across factory resets.

**New features**
- New AT command [AT$CW](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atcw) (contributed by hubmartin);
- New AT command [AT$CM](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atcm) (contributed by hubmartin).

**SHA256 checksums**:
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**Full changelog**: https://github.com/hardwario/lora-modem-abz/compare/v1.1.2...v1.1.3

This release contains mostly bug fixes, backwards-compatible improvements to existing functionality, and a couple of new features.

**Bug Fixes**
- Perform OTAA Join from the main execution thread and not from the IRQ thread
- Implement more reliable `AT$HALT` command
- Fix bugs in the handling of the low-power sleep state
- Fix bugs in the implementation of `AT$REBOOT`
- Fix activation and deactivation of class C
- Fix value parsing in `AT$CHMASK`
- Prohibit uplinks with empty payload and non-zero port number (not supported by LoRaMac-node)
- Ignore line noise on the ATCI UART port (LPUART1)

**Minor Improvements**
- Remove the debugging subsystem from release builds
- Include the latest fixes and improvements to LoRaMac-node (including support for [RP002-1.0.3](https://lora-alliance.org/resource_hub/rp2-1-0-3-lorawan-regional-parameters/))
- Add hard reboot option to `AT+REBOOT`
- Preserve DevEUI during factory reset by default (backwards compatibility with Murata Modem)

**New Features**
- New AT command [`AT$SESSION`](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atsession)
- New high-level Python library. Published to PyPI as [lora-module-abz](https://pypi.org/project/lora-modem-abz/).

**SHA256 checksums**:
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**Full changelog**: https://github.com/hardwario/lora-modem-abz/compare/v1.1.1...v1.1.2

This is a bug-fix release that decreases idle power consumption of the modem.

**SHA256 checksums**:
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**Full changelog**: https://github.com/hardwario/lora-modem-abz/compare/v1.1.0...v1.1.1

This release primarily improves OTAA Join handling in the modem:
- OTAA Join requests are [automatically retransmitted](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atjoin) up to eight times;
- The counter values returned by `AT+FRMCNT` after OTAA Join [match](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atfrmcnt) the original Murata Modem firmware;
- DevNonce is [preserved](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atfacnew), making it possible for the device to rejoin the network after a factory reset;
- The command [`AT+JOINDC`](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atjoindc) can be used to enable or disable OTAA Join duty cycling.

This release also includes the following minor improvements:
- `AT$VER` was switched to a machine readable format with [additional information](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atver-1) in the output;
- LoRAWAN certification port is disabled by default, but can be enabled with [`AT$CERT`](https://github.com/hardwario/lora-modem-abz/wiki/AT-Command-Interface#atcert).

**SHA256 checksums**:
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**Full changelog**: https://github.com/hardwario/lora-modem-abz/compare/v1.0.2...v1.1.0

This release fixes a number of bugs discovered since v1.0.1:

- Make sure the value of AT+DUTYCYCLE in persistently saved NVM (EEPROM)
- Make the UART buffering layer robust against overruns
- Prevent the starvation of the AT command thread during NVM updates
- Make AT+RFQ? return the RSSI and SNR of the most recent downlink
- Restore the LoRa sync word from NVM

**SHA256 checksums**:
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**Full changelog**: https://github.com/hardwario/lora-modem-abz/compare/v1.0.1...v1.0.2

This release fixes a few bugs that snuck into 1.0.0:

- Make the AT command parser resilient to UART noise and incorrect configuration (baud rate)
- Make sure DMA continues operating across UART port errors
- Remove the artificial delay at the beginning of main in debugging mode
- Fix the output of `AT+FRMCNT?`

SHA256 checksums:

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**Full Changelog**: https://github.com/hardwario/lora-modem-abz/compare/v1.0.0...v1.0.1