I have a u-blox EVK-R4 devkit with a SARA-R410M-02B which I believe is the same module used in the NovaM that is available for preorder. I am evaluating it for including in a product that will be using Hologram.
When I call the hologram.network.connect() method. It returns: “PPPError: Modem hangup - possibly due to an unregistered SIM.” and then if I try to rerun the code it returns: “Unable to detect a usable serial port” and has to be power cycled for the serial to reconnect.
The SIM card is showing up as being live in the hologram dashboard so something is connecting but not to a usable state.
For now I am running on a Linux Mint 19 desktop but this will be deployed into a yocto linux based i.MX8 device.
What are some troubleshooting steps I can run through for both the initial connection failure with PPP as well as to make the serial connection more reliable. I am currently using the direct USB connection to the module.