Unable to establish simultaneous connections using btgatt-client and btgatt-server

[Bhanuswaroophr]

We are using btgatt-client and btgatt-server on a device with RTL8821CU chipset to act as both central and peripheral device.

When we run btgatt-client, we can connect to another device running btgatt-server.
Similarly, when we run btgatt-server in our device, we can connect to another device running btgatt-client.
But when we run both btgatt-client and btgatt-server simultaneously, we see that we can do only one connection(from btgatt-client or btgatt-server).

Interestingly, if we run two instances of btgatt-client, we can connect to two DEVICES(which are acting as periperhal).
Since our device has limitation on flash and RAM size, we cannot use bluetoothd and dbus. We are compelled to use btgatt-server and btgatt-client as they are light weight. We are having only one adapter - hci0

Questions:

1. why we are unable to connect to do two connections from our device which acts as both central and peripheral.
2. Is there a technical limitation on why we cannot use our device as both central and peripheral device using btgatt-client and btgatt-server?
3. Do we have a solution in server/client code to make our device to act as both central and peripheral?

Please can we get help on this? We are blocked on this issue currently.

Thanks,
Bhanu