LTE Link Monitor times out (But works fine on Terminal) on Custom Board

[RodWatt]

I have a custom board based around the nRF9160. I am trying to use the LTE Link Monitor to test the Modem but and having problems.

I am able to connect to my board OK, please see below.

But when I send any command, I get a time out error, please see below.

Here is the log file.

2020-02-15T13:54:33.113Z INFO Modem port is opened
2020-02-15T13:54:33.119Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-15T13:54:44.259Z DEBUG modem >> AT\x0D\x0A
2020-02-15T13:54:45.260Z ERROR Error: 'AT
' timed out
2020-02-15T13:54:48.040Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-15T13:54:49.041Z ERROR Error: 'AT+CFUN?
' timed out

What I am finding weird is that the commands seem to work correctly if I use a normal terminal.

So I have a few questions.

1. Is there any reason why the link monitor times out while the terminal seems to work?

2. If I do need to use the terminal, is there any way I can echo the commands I am typing ?

3. Is there a standard script I can run from my terminal which will replicate what the LTE Link Monitor is doing?

Thanks,

Rod

[RodWatt]

I have just tried running the LTE Link Monitor on a PC as opposed to my Mac. It seems to be working. Not sure if the code does not work as well on a Mac or if there is a problem with my Mac.