How to turn off 9160 Modem programmatically in Asset_tracker

[mexco]

I want to add wifi connectivity to asset_tracker. It is required that MODEM is turned off. The program flow need to change so that instead of Modem, wifi Module is tried first to establish connectivity. If not successful, then turn on the 9160 Modem and use LTE network. I opened the datasheet of 9160. In that the Index "7.6 Registers" is left empty. The registers used in Modem are not shown in the document (see Image). So, how should I proceed, please give suggestions.

[Øyvind]

Hello, 

the DevZone team and Nordic Semiconductor are currently in a summer vacation period, some delays in answers must be expected due to lower staffing during this period. We apologize for the inconvenience. 

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. In that the Index "7.6 Registers" is left empty. The registers used in Modem are not shown in the document (see Image). So, how should I proceed, please give suggestions.

From the nRF9160 Product Specification - LTE Modem chapter:

The long term evolution (LTE) modem consists of baseband processing and RF parts, which together implement a complete 3GPP LTE release 13 (Rel-13) Cat-M1 and Cat-NB1 and LTE release 14 (Rel-14) Cat-NB1 and Cat-NB2 capable product. ... Application and modem domains interact through the interprocessor communication (IPC) mechanism. The LTE modem is accessible to users through the modem API.

In order to communicate with the modem from the application core of nRF9160, the application must implement the modem library. This allows users to send AT commands to the modem itself. In your case to shut down the modem itself, you will need to issue e.g. AT+CFUN=0

Have a look at the AT Client sample to test AT commands. 

Kind regards,
Øyvind