Create a sample keypair for simple client.

samples/simple-client/README.md

@@ -1,12 +1,10 @@
 To run this sample:
 
 1. Launch either the `samples/simple-server`, or `3rd-party/node-opcua-server`. Both servers expose the same variables. 
-2. a) `cargo run`, or b) `cargo run -- --subscribe`
+2. Run as `cargo run`
 
-Without an argument the client will connect to the server, read and print out the current values of v1, v2, v3 v4 and terminate. 
-
-With the `--subscribe` argument the client will connect to the server, create a subscription and monitor changes on v1, 
-v2, v3, v4 and continue to print out changes without terminating.
+The client connects to the server, creates a subscription to variables v1, 
+v2, v3, v4 and continues to print out changes to those values without terminating.
 
 ## Crypto
 

samples/simple-client/src/main.rs

@@ -29,6 +29,7 @@ fn main() {
         .application_name("Simple Client")
         .application_uri("urn:SimpleClient")
         .trust_server_certs(true)
+        .create_sample_keypair(true)
         .session_retry_limit(0)
         .client().unwrap();