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examples/network: Add UDP multicast client and server examples.
examples/network: Add UDP multicast client and server examples. Signed-off-by: IhorNehrutsa <Ihor.Nehrutsa@gmail.com>
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Jan 8, 2024
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# udp_multicast_client.py:: | ||
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import network, socket, errno, struct, time | ||
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print("connect to AP") | ||
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SSID = "SSID" | ||
PASSWORD = "PASSWORD" | ||
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wlan = network.WLAN(network.STA_IF) | ||
# class B network | ||
wlan.ifconfig(("172.16.55.55", "255.255.255.0", "172.16.55.1", "172.16.55.1")) | ||
wlan.active(True) | ||
wlan.connect(SSID, PASSWORD) | ||
while not wlan.isconnected(): | ||
pass | ||
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print("udp_multicast_client.py") | ||
print("client send GET and receive ACK from the server") | ||
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def inet_aton(str_addr): | ||
return bytes(map(int, str_addr.split("."))) | ||
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# TIMEOUT = None # block | ||
# TIMEOUT = 5 # seconds | ||
TIMEOUT = 0 # non blocking | ||
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MULTICAST_IP = "224.0.0.111" | ||
PORT = 5555 | ||
sockaddr = (MULTICAST_IP, PORT) | ||
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wlan = network.WLAN(network.STA_IF) | ||
client_ip = wlan.ifconfig()[0] | ||
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skt = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP | ||
skt.settimeout(None) | ||
skt.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | ||
skt.setsockopt( | ||
socket.IPPROTO_IP, | ||
socket.IP_ADD_MEMBERSHIP, | ||
struct.pack(">4s4s", inet_aton(MULTICAST_IP), inet_aton(client_ip)), | ||
) # join to the multicast address | ||
skt.bind(sockaddr) # not skt.connect(sockaddr) | ||
skt.settimeout(TIMEOUT) | ||
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t = 0 | ||
while True: | ||
try: | ||
if time.time() - t >= 3: | ||
t = time.time() | ||
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mac = wlan.config("mac") | ||
str_to_send = f"client_ip:{client_ip}\t mac:{'-'.join(map('{:02x}'.format, mac))}" | ||
skt.sendto(str_to_send, sockaddr) | ||
print(f'GET to {sockaddr}\t sent "{str_to_send}"') | ||
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received, addr = skt.recvfrom(1024) | ||
if received: | ||
print(f'ACK from {addr}\t received "{received.decode()}"') | ||
except OSError as e: | ||
if e.args[0] in (errno.EAGAIN, errno.ETIMEDOUT): | ||
pass | ||
else: | ||
try: | ||
skt.close() | ||
except: | ||
pass | ||
raise (e) |
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# udp_multicast_server.py:: | ||
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import network, socket, errno, struct, time | ||
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print("connect to AP") | ||
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SSID = "SSID" | ||
PASSWORD = "PASSWORD" | ||
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wlan = network.WLAN(network.STA_IF) | ||
# class C network | ||
wlan.ifconfig(("192.168.44.44", "255.255.255.0", "192.168.44.1", "192.168.44.1")) | ||
wlan.active(True) | ||
wlan.connect(SSID, PASSWORD) | ||
while not wlan.isconnected(): | ||
pass | ||
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print("udp_multicast_server.py") | ||
print("server receive GET and send ACK to the client") | ||
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def inet_aton(str_addr): | ||
return bytes(map(int, str_addr.split("."))) | ||
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# TIMEOUT = None # block | ||
# TIMEOUT = 5 # seconds | ||
TIMEOUT = 0 # non blocking | ||
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MULTICAST_IP = "224.0.0.111" | ||
PORT = 5555 | ||
sockaddr = (MULTICAST_IP, PORT) | ||
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wlan = network.WLAN(network.STA_IF) | ||
server_ip = wlan.ifconfig()[0] | ||
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skt = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP | ||
skt.settimeout(None) | ||
skt.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | ||
skt.setsockopt( | ||
socket.IPPROTO_IP, | ||
socket.IP_ADD_MEMBERSHIP, | ||
struct.pack(">4s4s", inet_aton(MULTICAST_IP), inet_aton(server_ip)), | ||
) # join to the multicast address | ||
skt.bind(sockaddr) | ||
skt.settimeout(TIMEOUT) | ||
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while True: | ||
try: | ||
received, addr = skt.recvfrom(1024) | ||
if received: | ||
print(f'GET from {addr}\t received "{received.decode()}"') | ||
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mac = wlan.config("mac") | ||
str_to_send = f"server_ip:{server_ip}\t mac:{'-'.join(map('{:02x}'.format, mac))}" | ||
skt.sendto(str_to_send, sockaddr) | ||
print(f'ACK to {sockaddr}\t sent "{str_to_send}"') | ||
except OSError as e: | ||
if e.args[0] in (errno.EAGAIN, errno.ETIMEDOUT): | ||
pass | ||
else: | ||
try: | ||
skt.close() | ||
except: | ||
pass | ||
raise (e) |