Re-broadcasting a message by a road side unit

1. A method, comprising:

receiving, by a supervisory service of a network of road side units (RSUs), a registration message broadcast by a first vehicle and captured by a RSU in the network of RSUs, the registration message comprising a signature that includes a sequence counter and a nonce;

registering, by the supervisory service, the first vehicle by validating the signature of the registration message without registering a media access control (MAC) address of the first vehicle and without causing to send a registration response to the first vehicle;

receiving, by the supervisory service, a message broadcast by a second vehicle addressed to the first vehicle and captured by at least one RSU in the network of RSUs;

selecting, by the supervisory service, one or more RSUs in the network of RSUs to re-broadcast the message; and

controlling, by the supervisory service, the one or more RSUs to re-broadcast the message.

2. The method of claim 1 , wherein the first vehicle broadcasts the registration message at an advertisement interval determined by a machine learning process or plain logic.

3. The method of claim 1 , wherein the nonce is generated by an iterator and progresses with the sequence counter.

4. The method of claim 1 , wherein the registration message is captured by a plurality of RSUs in the network of RSUs.

5. The method of claim 1 , wherein the message comprises a broadcast MAC address addressed to the network of RSUs and a unicast internet protocol (IP) address of the second vehicle.

6. The method of claim 1 , further comprising:

determining, by the supervisory service, an estimated location of the first vehicle, wherein selecting, by the supervisory service, the one or more RSUs in the network of RSUs to re-broadcast the message is based on the estimated location of the first vehicle.

7. The method of claim 6 , wherein determining, by the supervisory service, the estimated location of the first vehicle comprises using, by the supervisory service, a machine learning model to determine the estimated location of the first vehicle.

8. The method of claim 7 , wherein input data for the machine learning model comprises at least one of: a speed of the first vehicle, a direction of the first vehicle, a behavior of the first vehicle, a network topology of the network of RSUs.

9. The method of claim 1 , wherein controlling, by the supervisory service, the one or more RSUs to re-broadcast the message comprises, controlling, by the supervisory service, at least one RSU of the network of RSUs to unicast the message to another RSU of the network of RSUs.

10. The method of claim 1 , wherein the first vehicle and the second vehicle comprise autonomous vehicles or semi-autonomous vehicles.

11. An apparatus, comprising:

one or more network interfaces to communicate with a network;

a processor coupled to the network interfaces and configured to execute one or more processes; and

a memory configured to store a process executable by the processor, the process when executed configured to:

receive a registration message broadcast by a first vehicle and captured by a road side unit (RSU) in a network of RSUs, the registration message comprising a signature that includes a sequence counter and a nonce;

register the first vehicle by validating the signature of the registration message without registering a media access control (MAC) address of the first vehicle and without causing to send a registration response to the first vehicle;

receive a message broadcast by a second vehicle addressed to the first vehicle and captured by at least one RSU in the network of RSUs;

select one or more RSUs in the network of RSUs to re-broadcast the message; and

control the one or more RSUs to re-broadcast the message.

12. The apparatus as in claim 11 , wherein the first vehicle broadcasts the registration message at an advertisement interval determined by a machine learning process or plain logic.

13. The apparatus as in claim 11 , wherein the nonce is generated by an iterator and progresses with the sequence counter.

14. The apparatus as in claim 11 , wherein the registration message is captured by a plurality of RSUs in the network of RSUs.

15. The apparatus as in claim 11 , wherein the message comprises a broadcast MAC address addressed to the network of RSUs and a unicast internet protocol (IP) address of the second vehicle.

16. The apparatus as in claim 11 , wherein the process when executed is further configured to:

determine an estimated location of the first vehicle, wherein the selection of the one or more RSUs in the network of RSUs to re-broadcast the message is based on the estimated location of the first vehicle.

17. The apparatus as in claim 16 , wherein the determination of the estimated location of the first vehicle comprises using a machine learning model to determine the estimated location of the first vehicle.

18. The apparatus as in claim 11 , wherein to control of the one or more RSUs to re-broadcast the message comprises controlling at least one RSU of the network of RSUs to unicast the message to another RSU of the network of RSUs.

19. The apparatus as in claim 11 , wherein the first vehicle and the second vehicle comprise autonomous vehicles or semi-autonomous vehicles.

20. A tangible, non-transitory, computer-readable medium storing program instructions that cause a device to execute a process comprising:

receiving, by the device, a registration message broadcast by a first vehicle and captured by a road side unit (RSU) in a network of RSUs, the registration message comprising a signature that includes a sequence counter and a nonce;

registering, by the device, the first vehicle by validating the signature of the registration message without registering a media access control (MAC) address of the first vehicle and without causing to send a registration response to the first vehicle;

receiving, by the device, a message broadcast by a second vehicle addressed to the first vehicle and captured by at least one RSU in the network of RSUs;

selecting, by the device, one or more RSUs in the network of RSUs to re-broadcast the message; and

controlling, by the device, the one or more RSUs to re-broadcast the message.