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iperf3: fix server UDP mode #1060

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75c56ac
iperf3: Get working on the unix port of MicroPython.
dpgeorge Nov 14, 2025
2536a3d
iperf3: Factor out data transfer logic to separate function.
dpgeorge Nov 14, 2025
5309fcc
iperf3: Fix server UDP mode.
dpgeorge Nov 14, 2025
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103 changes: 64 additions & 39 deletions python-ecosys/iperf3/iperf3.py
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,33 @@ def make_cookie():
return cookie


def _transfer(udp, reverse, addr, s_data, buf, udp_last_send, udp_packet_id, udp_interval, stats):
if udp:
if reverse:
recvninto(s_data, buf)
udp_in_sec, udp_in_usec, udp_in_id = struct.unpack_from(">III", buf, 0)
if udp_in_id != udp_packet_id + 1:
stats.add_lost_packets(udp_in_id - (udp_packet_id + 1))
udp_packet_id = udp_in_id
stats.add_bytes(len(buf))
else:
t = ticks_us()
if t - udp_last_send > udp_interval:
udp_last_send += udp_interval
udp_packet_id += 1
struct.pack_into(">III", buf, 0, t // 1000000, t % 1000000, udp_packet_id)
n = s_data.sendto(buf, addr)
stats.add_bytes(n)
else:
if reverse:
recvninto(s_data, buf)
n = len(buf)
else:
n = s_data.send(buf)
stats.add_bytes(n)
return udp_last_send, udp_packet_id


def server_once():
# Listen for a connection
ai = socket.getaddrinfo("0.0.0.0", 5201)
Expand Down Expand Up @@ -233,13 +260,21 @@ def server_once():
s_data, addr = s_listen.accept()
print("Accepted connection:", addr)
recvn(s_data, COOKIE_SIZE)
udp = False
udp_packet_id = 0
udp_interval = None
udp_last_send = None
elif param.get("udp", False):
# Close TCP connection and open UDP "connection"
s_listen.close()
s_data = socket.socket(ai[0], socket.SOCK_DGRAM)
s_data.bind(ai[-1])
data, addr = s_data.recvfrom(4)
s_data.sendto(b"\x12\x34\x56\x78", addr)
s_data.sendto(struct.pack("<I", 987654321), addr)
udp_interval = 1000000 * 8 * param["len"] // param["bandwidth"]
udp = True
udp_packet_id = 0
udp_last_send = ticks_us() - udp_interval
else:
assert False

Expand Down Expand Up @@ -269,16 +304,21 @@ def server_once():
if cmd == TEST_END:
running = False
elif pollable_is_sock(pollable, s_data):
if reverse:
n = s_data.send(data_buf)
stats.add_bytes(n)
else:
recvninto(s_data, data_buf)
stats.add_bytes(len(data_buf))
udp_last_send, udp_packet_id = _transfer(
udp,
not reverse,
addr,
s_data,
data_buf,
udp_last_send,
udp_packet_id,
udp_interval,
stats,
)
stats.update()

# Need to continue writing so other side doesn't get blocked waiting for data
if reverse:
if reverse and not udp:
while True:
for pollable in poll.poll(0):
if pollable_is_sock(pollable, s_data):
Expand Down Expand Up @@ -360,6 +400,7 @@ def client(host, udp=False, reverse=False, bandwidth=10 * 1024 * 1024):
else:
param["tcp"] = True
param["len"] = 3000
udp_interval = None

if reverse:
param["reverse"] = True
Expand Down Expand Up @@ -403,33 +444,17 @@ def client(host, udp=False, reverse=False, bandwidth=10 * 1024 * 1024):
stats.stop()
else:
# Send/receiver data
if udp:
if reverse:
recvninto(s_data, buf)
udp_in_sec, udp_in_usec, udp_in_id = struct.unpack_from(">III", buf, 0)
# print(udp_in_sec, udp_in_usec, udp_in_id)
if udp_in_id != udp_packet_id + 1:
stats.add_lost_packets(udp_in_id - (udp_packet_id + 1))
udp_packet_id = udp_in_id
stats.add_bytes(len(buf))
else:
# print('UDP send', udp_last_send, t, udp_interval)
if t - udp_last_send > udp_interval:
udp_last_send += udp_interval
udp_packet_id += 1
struct.pack_into(
">III", buf, 0, t // 1000000, t % 1000000, udp_packet_id
)
n = s_data.sendto(buf, ai[-1])
stats.add_bytes(n)
else:
if reverse:
recvninto(s_data, buf)
n = len(buf)
else:
# print('TCP send', len(buf))
n = s_data.send(buf)
stats.add_bytes(n)
udp_last_send, udp_packet_id = _transfer(
udp,
reverse,
ai[-1],
s_data,
buf,
udp_last_send,
udp_packet_id,
udp_interval,
stats,
)

elif pollable_is_sock(pollable, s_ctrl):
# Receive command
Expand Down Expand Up @@ -534,7 +559,7 @@ def main():
client(opt_host, opt_udp, opt_reverse)


if sys.platform == "linux":
if sys.implementation.name != "micropython":

def pollable_is_sock(pollable, sock):
return sock is not None and pollable[0] == sock.fileno()
Expand All @@ -544,12 +569,12 @@ def ticks_us():

def ticks_diff(a, b):
return a - b

if __name__ == "__main__":
main()
else:

def pollable_is_sock(pollable, sock):
return pollable[0] == sock

from time import ticks_us, ticks_diff

if sys.platform == "linux" and __name__ == "__main__":
main()
2 changes: 1 addition & 1 deletion python-ecosys/iperf3/manifest.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,3 @@
metadata(version="0.1.4", pypi="iperf3", pypi_publish="uiperf3")
metadata(version="0.1.5", pypi="iperf3", pypi_publish="uiperf3")

module("iperf3.py")
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