andrey/k210-sdk-stuff
1
0
Fork 0
mirror of https://github.com/laanwj/k210-sdk-stuff.git synced 2024-11-21 17:06:19 +04:00
Code Issues Projects Releases Wiki Activity

linux: Mention mtu setting in esptun doc

Browse Source 
The standard tunnel mtu of 1500 will cause packets to be dropped,
causing transferring larger files to fail.
This commit is contained in:
Wladimir J. van der Laan 2020-02-22 14:23:31 +00:00
parent ce9505e670
commit 2819afaae5
2 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
linux/README.md
View File

@ -19,10 +19,14 @@ IP address and switch the interface on.
For example:
/root/esptun tun0 /dev/ttyS1 "accesspointname" "secretpassword" 192.168.122.21 23232
/sbin/ip link set dev tun0 mtu 1472
/sbin/ip addr add 10.0.1.2/24 dev tun0
/sbin/ip link set tun0 up
/sbin/ip route add default via 10.0.1.1 dev tun0
(setting the MTU to `1500-20-8` the typical network MTU minus IP and UDP header overhead, because
otherwise the ESP's network stack will drop the oversized packets)
Host side
---------
@ -30,7 +34,8 @@ On the other endpoint the tunnel is expected to be a host running `socat` or sim
the tunnel. For example:
sudo socat UDP:192.168.2.127:23232,bind=192.168.122.21:23232 \
TUN:10.0.1.1/24,tun-name=tundudp,iff-no-pi,tun-type=tun,su=$USER,iff-up
TUN:10.0.1.1/24,tun-name=tundudp,iff-no-pi,tun-type=tun,su=$USER,iff-up &
sudo ip link set dev tundudp mtu 1472
Optionally, enable forwarding and masquerading:

4
linux/esptun.c
View File

@ -395,12 +395,12 @@ static bool esp_read_responses(int fd, bool early_terminate)
}
/** Send a packet to ESP interface. */
static void esp_tx_packet(int fd, const uint8_t *esp_buffer, size_t size) {
static void esp_tx_packet(int fd, const uint8_t *buffer, size_t size) {
write_all(fd, S("AT+CIPSEND="));
write_uint(fd, size);
write_all(fd, S("\r\n"));
if (esp_read_responses(fd, false)) {
write_all(fd, esp_buffer, size);
write_all(fd, buffer, size);
esp_read_responses(fd, false);
}
}