LwCELL is a lightweight, platform independent, cellular modem AT commands parser, targeting (as of today) communication with SIMCOM based modules SIM800/SIM900 or SIM70xx. The module is written in C11 and is independent of the platform it runs on. Its main targets are embedded system devices like ARM Cortex-M, AVR, PIC and others, but can easily work under Windows, Linux or MAC environments.

Open documentation

• Written in C (C11), compatible with stdint.h data types
• Supports SIM800/SIM900 (2G) and SIM7070G (NB-IoT LTE) modules
• Platform independent and very easy to port
  • Provided examples for ARM Cortex-M or Win32 platforms
• Allows different configurations to optimize user requirements
• Supports operating-system implementations with advanced inter-thread communication
  • Currently only OS mode is supported
  • 2 different threads handling user data and received data
    • First (producer) thread (collects user commands from user threads and starts the command processing)
    • Second (process) thread reads the data from GSM device and does the job accordingly
• Allows sequential API for connections in client mode
• Full SMS API to send, read, delete and list messages
• Voice call API to start, answer and hang up calls
• Phonebook API to add, edit, delete, read, list and search entries
• Supports USSD code execution
• Includes several applications built on top of the library:
  • MQTT client for MQTT connection
• User friendly MIT license

Fresh contributions are always welcome. Simple instructions to proceed:

1. Fork Github repository
2. Follow C style & coding rules and use clang-format to format the code
3. Create a pull request to develop branch with new features or bug fixes

Alternatively you may:

1. Report a bug
2. Ask for a feature request