Suppose all nodes in a CAN network are configured using acceptance filters to rx packets that are addressed only to them. Example: Node A configured to rx packets addressed only to "A" in the 11-bit ID field and so on.
Scenario: If there are four nodes, A, B, C, and D.
Question 1: If A addresses a packet to E (not a valid ID), will node A's ACK flag be set indicating that a message has been acknowledged by a node? That is, if a message is not accepted by an acceptance filter, will, whether a message has been rxd or not be known to the sender.
Question 2 (depends on question 1): If A addresses a packet to D (valid ID), does acknowledgement of the message indicate that only D has successfully received the message? Or, does it mean that all nodes received the message though their acceptance filters are configured to rx only their specific IDs?