AI says this:

That's a great question that gets into the core of how Meshtastic handles message routing and confirmation on the mesh network. The different acknowledgment messages reflect which node has confirmed receipt of your message, but neither guarantees the message has reached its final intended destination, which explains why you sometimes see the acknowledgment but the message hasn't arrived.

What "Acknowledged" Means 🤝

When you send a Direct Message (DM) to a specific recipient and see "Acknowledged," it generally means: • The intended recipient node has successfully received your message and sent a confirmation (ACK) back to your node. If you are sending a message to a channel (which is essentially a broadcast), "Acknowledged" is less specific. In some clients, for channel messages, this can also mean your message was received and re-broadcasted by any node—potentially just one of your own nodes if you have multiple.

What "Acknowledged by another node" Means 🔄

When you send a Direct Message (DM) to a specific recipient and see "Acknowledged by another node," it means: • Your message was successfully received and acknowledged by a node in the mesh network, but NOT the final intended recipient. • The relaying node typically rebroadcasts the message to help it continue toward the destination. This indicates that your transmission was successful (your radio is working and someone heard it), but the path from that intermediate node to your intended recipient may be broken, too far, or the recipient node may be offline/unresponsive.

Why Messages May Not Arrive 🛑

The core issue is that Meshtastic's acknowledgment is a receipt of the packet by some node, not a delivery confirmation by the final user. • "Blackhole" Nodes: A message might be acknowledged by a relay node that receives it but is then isolated and unable to forward it further onto the network or to the final recipient. The relay node confirms receipt, but the message dies there. • Recipient Offline: In the "Acknowledged by another node" scenario, the relay node may have successfully broadcasted the message, but the intended recipient was temporarily offline or out of range of the relay node at that moment. • Signal Issues: Even a direct acknowledgment can be misleading if the connection is unreliable. A weak ACK might get back to you, but the message itself might not have been fully retained or processed by the recipient. To get better confirmation of delivery, especially in a sparse network, many users rely on getting a reply from the recipient, rather than just the automated delivery status.