Fix 5G not being displayed when in 5G NSA mode

[rslater-cs]

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI
• 📦 Chore (Release)
• ⏩ Revert

Description

The 5G modem only works in 5G non-standalone mode in the UK as this is the predominant 5G connection method. Previously the active technology was identified using qmi commands but this only returns the achor technology which is always LTE (4G). Modem manager will show the active technology as lte when on 4G and lte, 5gnr when on 5G.

-----------------------------------
  Status   |                    lock: sim-pin2
           |          unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
           |                   state: connected
           |             power state: on
           |             access tech: lte <---
           |          signal quality: 91% (recent)
-----------------------------------

-----------------------------------
  Status   |                    lock: sim-pin2
           |          unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
           |                   state: connected
           |             power state: on
           |             access tech: lte, 5gnr <---
           |          signal quality: 67% (recent)
  -----------------------------------

As the current method of mmcli info reporting put lists on the bus as individual endpoints this would have required GSM to keep a timeout based aggregation of access tech reports to figure out if we had LTE or LTE and 5Gnr, very messy. I have changed lists in mmcli to be formatted as string in the form <item1>,<item2>,.... So now GSM just has to listen to one bus event in order to infer all access tech types. This required some factoring of other functions which now handle strings rather than tables.

Screenshots/Recordings

Manual test

• 👍 yes
• 🙅 no

Manual test description

Run the code in a 5G area for the SIM you are using, making sure your SIM supports 5G. Check local-ui for the 5G mark on the primary modem

Added tests?

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help

Added to documentation?

• 📜 README.md
• 🙅 no documentation needed

[cpunt]

lgtm