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The /test/ folder on one of my K3s contains WAN diags, which use lipc commands (not AT commands) to talk to the radio. These diags support multiple brands and models of modems, and both GSM and non-GSM modems. Also, during the 511 diag, the comments say the 15-second countdown display is to give time for the user to place the device into a "cage" (Faraday cage, I presume). It also places loopback calls, and makes connections with "callbox equipment" (a Stingray-like device?). There are also notes that it can take the radio up to 34 seconds to power up after it was asleep, before it can accept commands. No AT commands in diags -- just lipc commands...
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