Hello! Summer researcher using Raspbian and Python 3.5.
I'm trying to use a Raspberry Pi 3 B+ to broadcast a message using the sockets library to other Pis (same model) over their shared ad-hoc network. All of the Pis can ping the others over the ad hoc network. The Pis can also communicate using pretty standard client-server code and the python socket library <https://docs.python.org/3.4/library/socket.html>. However, when I try to *broadcast* a message, the Pis give a "Network is unreachable" message (full error down below). A grad student I'm working with said that the script he provided me expects the server to be run in infrastructure mode, and configuration for ad-hoc mode is required to make it work correctly. This is confirmed, as I have successfully run the code on a desktop. I have poured over man pages and stackoverflow, and can't seem to find resources for how to configure socket broadcasts for ad-hoc networks. Any thoughts? The function is supposed to broadcast a message to a specific port after every [frequency] seconds, and any machines on the same network and connected to the same port should receive the message. The function is the only method of the *Server* class. *Broadcast function:* def broadcast(self, frequency, port): server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) server.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1) server.settimeout(0.2) while True: server.sendto("GET OUT OF MY SWAMP", ('<broadcast>', port)) print("message sent...") time.sleep(frequency) *Error message:* Traceback (most recent call last): File "myServer.py", line 31, in <module> s.broadcast(float(frequency),int(port)) File "myServer.py", line 22, in broadcast server.sendto("GET OUT OF MY SWAMP", ('<broadcast>', port)) socket.error: [Errno 101] Network is unreachable Thank you for your time. Please let me know any information you think would be useful! Best, John -- *John Hoeksema* Computer Science University of Notre Dame '21 _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor