Hello again,

 

After reviewing the sysmoQMOD manual, it seems this should be possible. The ATSAM4S4B has two USARTs, on the QMOD each one is routed to its own modem. We could however route them both to a single modem but to distinct SIM inputs.

 

On the remsim server, we could then prepare the slot maps which would include the bank slot, client id, and the client slot. If each client shall support two SIM slots, then we’d have two slot entries in the slot map, one for client slot 0 and another for 1. On the remsim client we’d call the server with the unique client id and client slot.

 

Not sure yet how to test this but can you please confirm this is feasible?

 

 

Thanks

 

 

 

 

From: Sohail Arshad <sohail.arshad@mclarenapplied.com>
Date: Thursday, 15 August 2024 at 15:39
To: simtrace@lists.osmocom.org <simtrace@lists.osmocom.org>
Subject: Dual SIM client support

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Hello,

 

I have a functioning setup of remsim as follow:

 

  • An x86 server that hosts a sysmoOCTSIM board. This server runs the bank daemon and also the remsim server.
  • An ARM64 client that hosts a SIMtrace2 board, and a 5G modem with two SIM inputs to support dual SIM single standby (DSSS). The SIMtrace2 connects to SIM slot 0 on the 5G modem via a flexi.
  • I use the remsim-apitool to create the slot map and assign SIMs to the client using the server IP, bank ID and client ID. Client slot is always 0.

 

I’d like to allocate two SIMs in the bank to this one client using only one ATSAM4S microcontroller to utilise the DSSS function of the modem e.g. SIM slot 1 in the bank is mapped to SIM slot 0 on the 5G modem for client ID 1. SIM slot 2 in the bank is mapped to SIM slot 1 on the same 5G modem for client ID 1. Is this possible with the current implementation of remsim? I cannot find any reference to this in the archives or in the manuals.

 

Thanks 

 

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