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renestraub / vcu-ui

VCU Pro minimal Web UI
MIT License
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RAT mismatch, ModemManager reports LTE, signal quality is provided for UMTS #40

Open renestraub opened 2 years ago

renestraub commented 2 years ago

Observed that modem is most likely using UMTS RAT, but MM reports LTE mode. When getting signal quality (mmcli .. —signal-get) values for UMTS are provided. Ping delays are more UMTS (or even 2G) like with several hundred milliseconds.

renestraub commented 2 years ago

Have to check what modem reports in this state. Disable modem manager and check with AT+COPS?

renestraub commented 2 years ago

Log of possible error case as screenshot 😂 image

renestraub commented 2 years ago

According to SW team —signal-get decodes all values provided by AT+CESQ. The RAT is reported by infrequent AT*COPS calls. The code to compute extended signal quality should therefore rely on —signal-get results, ignoring reported RAT.