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socket_comms: explicit multicast interface #96

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Merged
JordanYates merged 1 commit into from
Nov 27, 2025
Merged

socket_comms: explicit multicast interface #96

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3 changes: 2 additions & 1 deletion src/infuse_iot/socket_comms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -235,6 +235,7 @@ def __init__(self, multicast_address):
# Multicast output socket
self._output_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
self._output_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
self._output_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF, socket.inet_aton("127.0.0.1"))
self._output_addr = multicast_address
# Single input socket
unicast_address = ("localhost", multicast_address[1] + 1)
Expand Down Expand Up @@ -266,7 +267,7 @@ def __init__(self, multicast_address, rx_timeout=0.2):
self._input_sock.bind(("", multicast_address[1]))
else:
self._input_sock.bind(multicast_address)
mreq = struct.pack("4sl", socket.inet_aton(multicast_address[0]), socket.INADDR_ANY)
mreq = struct.pack("4s4s", socket.inet_aton(multicast_address[0]), socket.inet_aton("127.0.0.1"))
self._input_sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
self._input_sock.settimeout(rx_timeout)
# Unicast output socket
Expand Down