Dart isolate command pattern - dart

Question

Is it possible create a thread for commands and a thread to receive answers from server ?
Isolate are not shared memory but it is possible share few stuff over messages.
I would like to understand how to create a command pattern or what I need in order to write a code to send commands to server and take decision based on server answer
here the simplified code
// receiver thread
void rIsolate(SendPort Listener) async {
//Listen for any data from server
while (true) { //Receiver LOOP
var data = Receive();
//Send received data to client
Listener.send(data);
}
}
//Client thread
void client(SendPort clientListener) async {
ReceivePort port = ReceivePort();
//Create a new receiver isolate
await Isolate.spawn(rIsolate, port.sendPort);
port.listen((data) async{
// Receiving data from rIsolate
if (data=='hello world'){ command2().. }
});
print("::: Start... :::");
// Commands..
requestData(); // request for new data
command2(); //??
...
}
// ::: default thread :::
void main() async {
// ::::::: Create new Client :::::::
ReceivePort clientPort = ReceivePort();
await Isolate.spawn(client, clientPort.sendPort);
clientPort.listen((message) {
// msg from client()..
print(message);
});
}
I dont'know where to put the code relating to commands and at the same time keep active two thread. Any suggestion or link thank you