Connecting to Modem

[MosesMuiru]

Discussion: #829

This PR introduces connection to any modem with a QMI interface and fetches detailed information about the modem and SIM. It also reports signal strength.

Hardware Used

• Rasberry pi 5
• Quectel ec25-EU modem

Changes included:

• Automatic connection to modems via QMI interface
• Retrieval of modem details (manufacturer, model, hardware path, identifiers)
• Retrieval of SIM details (ICCID, APN, network provider)
• Retrieval of connection status and signal strength (dBm, bars, ASU)

Todo Improvements:

• Cleaner UI to show the signal strength(4 bars)
• Track data received and sent over the modem
• Add the ability to send Nerves commands via SMS
• Report and handle failures (connection loss, modem not found, etc.)

[github-actions]

📦 To trigger a firmware build, comment /build below.
To build a specific target, comment /build <target> with on of the following targets
Valid target names:

• ex_nvr_rpi4
• ex_nvr_rpi5
• giraffe

You can also specify a custom version: /build <target> version=<version>
Examples:
/build version=1.0.0-test
/build ex_nvr_rpi5 version=1.0.0-test.123

If no version is specified, one will be generated automatically.

[MosesMuiru]

updated ui to show modem details and current state

[MosesMuiru]

This table shows top 4 messages that have been sent to the modem. I’m trying to figure out how to receive incoming messages in real-time and filter them to represent a specific command (work in progress). AT doesn't order messages, you have to access them either via index, or all ,
reference: https://www.smssolutions.net/tutorials/gsm/receivesmsat/

[MosesMuiru]

Timestamp to show how long ago message was sent,