Set response timeout value during echo SendMessage (project-chip#9096)

src/protocols/echo/EchoClient.cpp

@@ -29,6 +29,9 @@ namespace chip {
 namespace Protocols {
 namespace Echo {
 
+// The Echo message timeout value in milliseconds.
+constexpr uint32_t kEchoMessageTimeoutMsec = 800;
+
 CHIP_ERROR EchoClient::Init(Messaging::ExchangeManager * exchangeMgr, SecureSessionHandle session)
 {
     // Error if already initialized.
@@ -74,6 +77,8 @@ CHIP_ERROR EchoClient::SendEchoRequest(System::PacketBufferHandle && payload, Me
         return CHIP_ERROR_NO_MEMORY;
     }
 
+    mExchangeCtx->SetResponseTimeout(kEchoMessageTimeoutMsec);
+
     // Send an Echo Request message.  Discard the exchange context if the send fails.
     err = mExchangeCtx->SendMessage(MsgType::EchoRequest, std::move(payload),
                                     sendFlags.Set(Messaging::SendMessageFlags::kExpectResponse));
@@ -114,6 +119,7 @@ CHIP_ERROR EchoClient::OnMessageReceived(Messaging::ExchangeContext * ec, const
 
 void EchoClient::OnResponseTimeout(Messaging::ExchangeContext * ec)
 {
+    mExchangeCtx = nullptr;
     ChipLogProgress(Echo, "Time out! failed to receive echo response from Exchange: %p", ec);
 }