turnutils_uclient with big packet size does not work for coturn about coturn HOT 8 CLOSED

plus, I dont get any error or warning in log.

[deleted comment]

taking it back for investigation

I tested it on several systems (BSDs and Linuxes) with the latest version and I 
could not reproduce the problem. This is the output that I have on a Linux Mint:

oleg@limper ~/c/coturn $ 
./examples/scripts/longtermsecure/secure_tcp_client_c2c_tcp_relay.sh -m 50 -l 
10000
0: Total connect time is 5
0: 2450 connections are completed
0: start_mclient: msz=50, tot_send_msgs=0, tot_recv_msgs=0, tot_send_bytes ~ 0, 
tot_recv_bytes ~ 0
1: start_mclient: msz=50, tot_send_msgs=0, tot_recv_msgs=0, tot_send_bytes ~ 0, 
tot_recv_bytes ~ 0
2: start_mclient: msz=50, tot_send_msgs=13, tot_recv_msgs=13, tot_send_bytes ~ 
130000, tot_recv_bytes ~ 130000
3: start_mclient: msz=50, tot_send_msgs=317, tot_recv_msgs=317, tot_send_bytes 
~ 3170000, tot_recv_bytes ~ 3170000
4: start_mclient: msz=50, tot_send_msgs=990, tot_recv_msgs=986, tot_send_bytes 
~ 9900000, tot_recv_bytes ~ 9860000
5: start_mclient: msz=50, tot_send_msgs=2263, tot_recv_msgs=2251, 
tot_send_bytes ~ 22630000, tot_recv_bytes ~ 22510000
6: start_mclient: msz=50, tot_send_msgs=4140, tot_recv_msgs=4100, 
tot_send_bytes ~ 41400000, tot_recv_bytes ~ 41000000
7: start_mclient: msz=50, tot_send_msgs=6518, tot_recv_msgs=6453, 
tot_send_bytes ~ 65180000, tot_recv_bytes ~ 64530000
8: start_mclient: msz=50, tot_send_msgs=9034, tot_recv_msgs=8921, 
tot_send_bytes ~ 90340000, tot_recv_bytes ~ 89210000
9: start_mclient: msz=50, tot_send_msgs=11552, tot_recv_msgs=11411, 
tot_send_bytes ~ 115520000, tot_recv_bytes ~ 114110000
10: start_mclient: msz=50, tot_send_msgs=14063, tot_recv_msgs=13886, 
tot_send_bytes ~ 140630000, tot_recv_bytes ~ 138860000
11: start_mclient: msz=50, tot_send_msgs=16575, tot_recv_msgs=16346, 
tot_send_bytes ~ 165750000, tot_recv_bytes ~ 163460000
11: start_mclient: msz=50, tot_send_msgs=18838, tot_recv_msgs=18576, 
tot_send_bytes ~ 188380000, tot_recv_bytes ~ 185760000
13: start_mclient: msz=50, tot_send_msgs=21357, tot_recv_msgs=21057, 
tot_send_bytes ~ 213570000, tot_recv_bytes ~ 210570000
14: start_mclient: msz=50, tot_send_msgs=23869, tot_recv_msgs=23537, 
tot_send_bytes ~ 238690000, tot_recv_bytes ~ 235370000
15: start_mclient: msz=50, tot_send_msgs=26388, tot_recv_msgs=26014, 
tot_send_bytes ~ 263880000, tot_recv_bytes ~ 260140000
16: start_mclient: msz=50, tot_send_msgs=28907, tot_recv_msgs=28499, 
tot_send_bytes ~ 289070000, tot_recv_bytes ~ 284990000
17: start_mclient: msz=50, tot_send_msgs=31415, tot_recv_msgs=30958, 
tot_send_bytes ~ 314150000, tot_recv_bytes ~ 309580000
18: start_mclient: msz=50, tot_send_msgs=33942, tot_recv_msgs=33437, 
tot_send_bytes ~ 339420000, tot_recv_bytes ~ 334370000
19: start_mclient: msz=50, tot_send_msgs=36453, tot_recv_msgs=35897, 
tot_send_bytes ~ 364530000, tot_recv_bytes ~ 358970000
20: start_mclient: msz=50, tot_send_msgs=38968, tot_recv_msgs=38379, 
tot_send_bytes ~ 389680000, tot_recv_bytes ~ 383790000
21: start_mclient: msz=50, tot_send_msgs=41484, tot_recv_msgs=40853, 
tot_send_bytes ~ 414840000, tot_recv_bytes ~ 408530000
22: start_mclient: msz=50, tot_send_msgs=43985, tot_recv_msgs=43316, 
tot_send_bytes ~ 439850000, tot_recv_bytes ~ 433160000
23: start_mclient: msz=50, tot_send_msgs=46189, tot_recv_msgs=45498, 
tot_send_bytes ~ 461890000, tot_recv_bytes ~ 454980000
24: start_mclient: msz=50, tot_send_msgs=48015, tot_recv_msgs=47311, 
tot_send_bytes ~ 480150000, tot_recv_bytes ~ 473110000
25: start_mclient: msz=50, tot_send_msgs=49242, tot_recv_msgs=48535, 
tot_send_bytes ~ 492420000, tot_recv_bytes ~ 485350000
26: start_mclient: msz=50, tot_send_msgs=49876, tot_recv_msgs=49162, 
tot_send_bytes ~ 498760000, tot_recv_bytes ~ 491620000
27: start_mclient: msz=50, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
28: start_mclient: msz=50, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
28: start_mclient: msz=50, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
29: start_mclient: msz=50, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
31: start_mclient: msz=50, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
32: start_mclient: msz=48, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
33: start_mclient: msz=41, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
34: start_mclient: msz=31, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
35: start_mclient: msz=20, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
36: start_mclient: msz=7, tot_send_msgs=50000, tot_recv_msgs=49285, 
tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
36: start_mclient: tot_send_msgs=50000, tot_recv_msgs=49285
36: start_mclient: tot_send_bytes ~ 500000000, tot_recv_bytes ~ 492850000
36: Total transmit time is 36
36: Total lost packets 715 (1.430000%), total send dropped 0 (0.000000%)
36: Average round trip delay 0.012519 ms; min = 0 ms, max = 20 ms
36: Average jitter 0.132008 ms; min = 0 ms, max = 398 ms

can you please try on remote turn server, not installed on local computer?

We want to separate the network issues from the TURN server / TURN
client issues, right ? That's why I was intentiallt running it
locally. If it works locally and does not work remotely, then this is
a network problem.

OK, but why do we have even that Total lost packets 715 (1.430000%) ?

Because the network load could not be handled in full by the particular kernel 
and the hardware. Just too high data rate. That's 50 x 10000 x 50 = 25000000 
bytes per second that is 200Mbits per second.