Replace ClientFindServers with unified Client, use trust store directories

Replace the single-purpose ClientFindServers program with a unified Client
that supports three operations via CLI: find-servers, get-endpoints, and
read-time.  This simplifies the architecture by using one client binary with
a single config file instead of a monolithic program that did everything in
one run.

Split the ServerRegister config into separate server and client config files
so the LDS-registration credentials are isolated from the server's own
settings.  The discovery URL moves from config to a CLI argument.

Replace repeated trustList config entries with a single trustStore directory
path.  Each program now points to a directory under certs/trust/ containing
.der files, so adding or removing trust is a file-copy operation rather than
editing every config file.  Add loadTrustStore()/freeTrustStore() to
common.c and remove the now-unused configGetAll() from the config parser.

Simplify the test matrix from 6 to 4 cases (security and auth are
orthogonal, so the full 3x2 matrix is unnecessary).  Update run_test.sh to
invoke the new Client three times and use port-polling instead of sleep.

1 files changed, 7 insertions, 18 deletions

diff --git a/tests/aes128_user/server_register.conf b/tests/aes128_user/server_register.conf
index e100129..b0ce271 100644
--- a/tests/aes128_user/server_register.conf
+++ b/tests/aes128_user/server_register.conf
@@ -1,25 +1,14 @@
-# ServerRegister — test: aes128_user
+# ServerRegister server config — test: aes128_user
 
 port = 14841
 applicationUri = urn:bobink.ServerRegister
-serverCertificate = certs/ServerRegister_cert.der
-serverPrivateKey = certs/ServerRegister_key.der
-clientCertificate = certs/ServerRegisterClient_cert.der
-clientPrivateKey = certs/ServerRegisterClient_key.der
+certificate = certs/ServerRegister_cert.der
+privateKey = certs/ServerRegister_key.der
 
-discoveryEndpoint = opc.tcp://localhost:14840
 registerInterval = 10
 
-securityMode = SignAndEncrypt
-securityPolicy = Aes128_Sha256_RsaOaep
+authMode = user
+username = user
+password = password
 
-serverAuthMode = user
-serverUsername = user
-serverPassword = password
-
-clientAuthMode = user
-clientUsername = user
-clientPassword = password
-
-trustList = certs/ServerLDS_cert.der
-trustList = certs/ClientFindServers_cert.der
+trustStore = certs/trust/server_register