Add HL78XX Modem Driver Implementation Using Modem Chat Framework

[zafersn]

This pull request introduces the initial draft implementation of the HL78XX modem driver, built on the modem_chat framework. The current version establishes the core structure and essential functionality required to support the HL78XX modem series.

The primary objective at this stage is to review and align on the overall design and integration approach. Following this, development will continue with additional features such as:

• Power saving mode support

• User pipe connection handling

• Other modem-specific enhancements

• Verified compatibility and correct operation with the following sample applications:

  • aws_mqtt
  • dns_resolve
  • big_http_download
  • lwm2m

Feedback on both structure and test approach is welcome.

[Copilot]

Pull Request Overview

This pull request introduces the initial HL78XX modem driver implementation based on the modem_chat framework while updating sample applications to integrate power management calls. Key changes include:

• Adding power management includes and calls in sample applications to power on the modem.
• Enhancing the modem socket poll routine with temporary POLLOUT handling.
• Introducing new HL78XX utility and header files to support modem functionality.

Reviewed Changes

Copilot reviewed 8 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
samples/net/lwm2m_client/src/lwm2m-client.c	Added power management headers and a power-on invocation for the HL78XX modem.
samples/net/cloud/aws_iot_mqtt/src/main.c	Added similar power management initialization for the modem in the AWS IoT MQTT sample.
drivers/modem/modem_socket.c	Updated POLLOUT event handling with temporary logging and fallback behavior.
drivers/modem/hl78xx/hl78xx_utility.c	Added HL78XX utility functions; note an inconsistent module name in the log registration.
drivers/modem/hl78xx/hl78xx.h	Introduced declarations and definitions supporting the HL78XX modem driver.

Files not reviewed (6)

• drivers/modem/CMakeLists.txt: Language not supported
• drivers/modem/Kconfig: Language not supported
• drivers/modem/hl78xx/CMakeLists.txt: Language not supported
• samples/net/cloud/aws_iot_mqtt/boards/hl78xx_chat.conf: Language not supported
• samples/net/lwm2m_client/Kconfig: Language not supported
• samples/net/lwm2m_client/overlay-hl78xx_chat.conf: Language not supported

Comments suppressed due to low confidence (1)

drivers/modem/hl78xx/hl78xx_utility.c:18

• [nitpick] The module name 'hl7812_utility' appears inconsistent with the HL78XX naming convention used elsewhere. Consider renaming it to 'hl78xx_utility' for naming consistency.

LOG_MODULE_REGISTER(hl7812_utility, CONFIG_MODEM_LOG_LEVEL);

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.2% Duplication on New Code

See analysis details on SonarQube Cloud