nRF53 interfacing with external modem

Question

Hi, 
 If i use nrf53 to interface with a modem(nrf91 or any other modem), is it possible to run the the TCP + TLS stack on nrf53? 
 In case nrf91 the the BSD lib runs on the M33 application processor, is it possible to run the TCP stack with BSD layer on the nrf53 application core and used the external modem as PPPoS? 
 On nRF53 BLE and NFC be used simultaneously used? 
 regards 
 KK

Heidi · Accepted Answer

Hi! 
 
 The short answer is no. 
 
 The long answer is that only the application core on the nRF9160 SiP has access to the modem core, so you can't just run BSDLib on the nRF53. and expect it to interface with the modem. And since the source code for BSDLib isn't available you can't split it up to have the "modem-interface" running on the 91, and the rest running on the 53.

The 91 has "raw sockets" that could probably be used to have the IP stack outside the modem, but then you would have to write everything from scratch to expose this functionality. The nRF9160 was never meant to be used in this way though, so this isn't something we recommend or support. 
 
 Have you checked out the Serial LTE Modem example available in NCS?

Why do you need to run the IP stack on the 53? If you give me more details about what you want to achieve, I could try to help you find a solution. 
 
 Best regards, 
 Heidi

nRF53 interfacing with external modem

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