Sending Assisted GNSS (A-GNSS) to Bangle 2 GPS (AT6558)

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Mark_M
It would be very nice to have such gateway. Because that would allow to update AT6558 firmware. Currently it is quite outdated. Some CASIC commands work, some do not. I even cannot figure out how to see SW version.
```
//MON-VER
Serial2.write([0xBA,0xCE, 0x00,0x00, 0x0A,0x04, 0x00,0x00,0x0A,0x04]);
//MON-HW
Serial2.write([0xBA,0xCE, 0x00,0x00, 0x0A,0x09, 0x00,0x00,0x0A,0x09]);
```
It returns ACK-NACK

When I try to query via CFG-MSG, it again returns ACK-NACK
```
Serial2.write([186, 206, 4, 0, 6, 1, 10, 4, 255, 255, 14, 4, 5, 1])
```
Some messages return ACK-ACK, but never return result payload.
I suspect that there is very early version of CASIC.

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