Oops, that should have been 20719.
For our device only one SPP session will be active at a time. If you wanna do SPP transfer with second device , you need to disconnect SPP connection from the first device.
You can test our SPP snip project (/20719-B1_Bluetooth/apps/snip/bt/spp) . Pair with first device, after that pair with second device and do SPP connect to one after the other.