[LNET]How to receive many lines?
lazarus / 38-Networking and Web Programming

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Borneq · 2020-01-12 18:14

I am testing LNET - very nice low-level library.
1. It is non blocking - how to get more than one line which come in
OnReceive event?
2. Is posssible that sended messages will:
- joined many messaged to one peer event OnReceive?
- split message to many peer event OnReceive?

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Borneq · 2020-01-12 21:42

Tests:
multiple short messages are joined to 100-200 bytes message, long
message is trying send in whole but is disconnect is larger than
165kB-195kB (on localhost, but on remote it probably will much
smaller)
https://stackoverflow.com/questions/2613734/maximum-packet-size-for-a-
tcp-connection
Quotehe absolute limitation on TCP packet size is 64K (65535 bytes)
The MTU (Maximum Transmission Unit) for Ethernet, for instance, is
1500 bytes
1500 bytes with headers, it must be smaller than 1500 bytes
Fast Wireshark tests: maximum TCP payload = 1332 bytes

Problem:
1.sometimes peer send multiple messages at once, sometimes wait for
reply; must be timer? what amount of time? usual ping is about 26 ms
for near address to 46 ms for world address, but localhost has ping
<1ms
2.sometimes can messages be slower even than 46 ms when server must do
time consuming operation on his side.
3. If I implementing waiting, I obtain de facto blocked sockets and I
havent advantages LNet unblocking sockets? and maybe better choose
unblocking which are easier?

What means Timeout?