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-rw-r--r--src/low-can-binding.cpp7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/low-can-binding.cpp b/src/low-can-binding.cpp
index 8ea885d1..08301933 100644
--- a/src/low-can-binding.cpp
+++ b/src/low-can-binding.cpp
@@ -133,7 +133,12 @@ static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe,
std::vector<diagnostic_message_t*> found;
configuration_t::instance().find_diagnostic_messages(build_DynamicField(sig), found);
DiagnosticRequest* diag_req = new DiagnosticRequest(found.front()->build_diagnostic_request());
-
+
+ // If the requested diagnostic message isn't supported by the car then unssubcribe.
+ // no matter what we want, worse case will be a fail unsubscription but at least we don't
+ // poll a PID for nothing.
+ if(found.front()->get_supported())
+ subscribe = false;
if(subscribe)
{
float frequency = found.front()->get_frequency();