examples/rpmsgsocket: add rpmsg socket test cases

[luckyyaojin]

Summary

Analyze parameters to determine whether to use non blocking mode and whether to delay before exiting.

Mainly used for quickly establishing connections, sending a small message and immediately disconnecting, multiple runs can simulate the "multiple connections" scenario, and cooperate with server-side logic to verify the reliability or concurrency pressure of short connections.f the delay parameter is enabled, sleep for 1 second after normal completion, then close the socket and release the buffer.

Analyze parameters to determine whether to use non blocking mode and whether to delay before exiting.

Impact

none

Testing

server cmd and log
qemu-armv8a-server> rpsock_server server_multi_times block hh ap 3
server_multi_times: 0
server: create socket SOCK_STREAM nonblock 0
server: bind cpu ap, name hh ...
server: listen ...
server: try accept ...
server: Connection accepted -- 1068
server Complete ret 64, errno 0
server: Terminating
server_multi_times: 1
server: create socket SOCK_STREAM nonblock 0
server: bind cpu ap, name hh ...
server: listen ...
server: try accept ...
server: Connection accepted -- 1070
server Complete ret 64, errno 0
server: Terminating
server_multi_times: 2
server: create socket SOCK_STREAM nonblock 0
server: bind cpu ap, name hh ...
server: listen ...
server: try accept ...
server: Connection accepted -- 1072
server Complete ret 64, errno 0
server: Terminating

ap cmd and log
qemu-armv8a-ap> rpsock_client conn_multi_times block hh droid 3
client conn_multi_times: 0
client: create socket SOCK_STREAM nonblock 0
client: Connecting to droid,hh...
client: Connected
client send data, total len 64, BUFHEAD process0060, name:hh
client: Terminating
client conn_multi_times: 1
client: create socket SOCK_STREAM nonblock 0
client: Connecting to droid,hh...
client: Connected
client send data, total len 64, BUFHEAD process0060, name:hh
client: Terminating
client conn_multi_times: 2
client: create socket SOCK_STREAM nonblock 0
client: Connecting to droid,hh...
client: Connected
client send data, total len 64, BUFHEAD process0060, name:hh
client: Terminating

if we use delay ,client will exit for a while
qemu-armv8a-ap> rpsock_client conn_multi_times block hh droid 1 delay
client conn_multi_times: 0
client: create socket SOCK_STREAM nonblock 0
client: Connecting to droid,hh...
client: Connected
client send data, total len 64, BUFHEAD process0028, name:hh
client: Terminating