Thanks for your thoughts, David!
I figured it out how to set a defined source port (in my case 69): Just
insert this line to change the local port in the pcb:
netconn_connect(tftptxcon,&modsrv_addr,ip_data_out.port); //
Open connection
tftptxcon->pcb.udp->local_port=69; // Set local
(source) port
tftpsrvbuf=netbuf_new(); // Create netbuf
.....
David Empson schrieb:
With the raw API, the trick is to
use udp_bind() to bind the PCB to a specified local IP address and port.
It looks like netconn_bind() will
achieve the same thing for the netconn API, and lwip_bind() for the
sockets API.
In each case, the bind is done after
creating the PCB with the appropriate "new" call, before doing the
first send/sendto/sendto_if.
Judging from a comment in api_lib.c,
it isn't clear whether you can safely re-bind an existing PCB, so you
might need to destroy the PCB and recreate it if you need to change
your source port.
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