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Hello guys, what would the steps be to finding and reverse engineer the command in a CAN bus that it is in a passive waiting state, needing the message in order to transmit messages?
Is this scenario under j1939 only?
thanks
j1939 typically is constant broadcast,
j1979 and UDS would be a command and response (think obd2 scantools),
ultimately you have typically a device you control requesting specific information from (the scantool), and the responses return information to the scantool.
most messages are responded by a value of 8 + original request message id
