Client and server example

The example in examples/csp_server_client.c provides a simple server/client setup, where the client sends a request to the server and receives a reply. The code can be compiled to an executable using ./examples/buildall.py.

The example supports these drivers and interfaces in CSP:

ZMQHUB: -z <host name|ip>

Requires no extra hardware, as it uses standard network. The zmqproxy will need to be started.
CAN: -c <can device>

Requires a physical CAN interface. There are several CAN dongles on the market, for example https://www.peak-system.com/PCAN-USB.199.0.html.

To achieve best performance and stability, following options can be set on the CAN device:
```
linux: sudo ip link set dev can0 down
linux: sudo ip link set dev can0 up type can bitrate 1000000 restart-ms 100
linux: sudo ip link set dev can0 txqueuelen 100
```
KISS: -k <serial device>

Requires a serial interface, e.g. USB dongle.

Running the example

If the example is started without any interfaces, it will use the loopback interface for communication between client and server:

libcsp$ ./build/examples/csp_server_client
Initialising CSP
Connection table
[00 0x7fbd8f574080] S:0, 0 -> 0, 0 -> 0 (17) fl 0
[01 0x7fbd8f574198] S:0, 0 -> 0, 0 -> 0 (18) fl 0
[02 0x7fbd8f5742b0] S:0, 0 -> 0, 0 -> 0 (19) fl 0
[03 0x7fbd8f5743c8] S:0, 0 -> 0, 0 -> 0 (20) fl 0
[04 0x7fbd8f5744e0] S:0, 0 -> 0, 0 -> 0 (21) fl 0
[05 0x7fbd8f5745f8] S:0, 0 -> 0, 0 -> 0 (22) fl 0
[06 0x7fbd8f574710] S:0, 0 -> 0, 0 -> 0 (23) fl 0
[07 0x7fbd8f574828] S:0, 0 -> 0, 0 -> 0 (24) fl 0
Interfaces
LOOP       addr: 0 netmask: 14 dfl: 0
           tx: 00000 rx: 00000 txe: 00000 rxe: 00000
           drop: 00000 autherr: 00000 frame: 00000
           txb: 0 (0B) rxb: 0 (0B) 

Client task started
Server task started
Ping address: 0, result 2 [mS]
reboot system request sent to address: 0
Packet received on MY_SERVER_PORT: Hello world A

Running the example with ZMQHUB interface

To run the example with ZMQHUB interfaces, start the zmqproxy, client and server in three separate processes.

libcsp$ ./build/examples/zmqproxy
Subscriber task listening on tcp://0.0.0.0:6000
Publisher task listening on tcp://0.0.0.0:7000
Capture/logging task listening on tcp://0.0.0.0:6000
Packet: Src 3, Dst 2, Dport 1, Sport 18, Pri 2, Flags 0x00, Size 100
Packet: Src 2, Dst 3, Dport 18, Sport 1, Pri 2, Flags 0x00, Size 100
Packet: Src 3, Dst 2, Dport 4, Sport 19, Pri 2, Flags 0x01, Size 8
Packet: Src 3, Dst 2, Dport 10, Sport 20, Pri 2, Flags 0x00, Size 14

libcsp$ ./build/examples/csp_server -z localhost -a 2
Initialising CSP
Connection table
[00 0x7f266ec1d080] S:0, 0 -> 0, 0 -> 0 (17) fl 0
[01 0x7f266ec1d198] S:0, 0 -> 0, 0 -> 0 (18) fl 0
[02 0x7f266ec1d2b0] S:0, 0 -> 0, 0 -> 0 (19) fl 0
[03 0x7f266ec1d3c8] S:0, 0 -> 0, 0 -> 0 (20) fl 0
[04 0x7f266ec1d4e0] S:0, 0 -> 0, 0 -> 0 (21) fl 0
[05 0x7f266ec1d5f8] S:0, 0 -> 0, 0 -> 0 (22) fl 0
[06 0x7f266ec1d710] S:0, 0 -> 0, 0 -> 0 (23) fl 0
[07 0x7f266ec1d828] S:0, 0 -> 0, 0 -> 0 (24) fl 0
Interfaces
LOOP      addr: 0 netmask: 14 dfl: 0
          tx: 00000 rx: 00000 txe: 00000 rxe: 00000
          drop: 00000 autherr: 00000 frame: 00000
          txb: 0 (0B) rxb: 0 (0B)

ZMQHUB    addr: 2 netmask: 0 dfl: 1
          tx: 00000 rx: 00000 txe: 00000 rxe: 00000
          drop: 00000 autherr: 00000 frame: 00000
          txb: 0 (0B) rxb: 0 (0B)

Server task started
Packet received on SERVER_PORT: Hello world A

libcsp$ ./build/examples/csp_client -z localhost -a 3 -C 2
Initialising CSP
Connection table
[00 0x7f471efc1080] S:0, 0 -> 0, 0 -> 0 (17) fl 0
[01 0x7f471efc1198] S:0, 0 -> 0, 0 -> 0 (18) fl 0
[02 0x7f471efc12b0] S:0, 0 -> 0, 0 -> 0 (19) fl 0
[03 0x7f471efc13c8] S:0, 0 -> 0, 0 -> 0 (20) fl 0
[04 0x7f471efc14e0] S:0, 0 -> 0, 0 -> 0 (21) fl 0
[05 0x7f471efc15f8] S:0, 0 -> 0, 0 -> 0 (22) fl 0
[06 0x7f471efc1710] S:0, 0 -> 0, 0 -> 0 (23) fl 0
[07 0x7f471efc1828] S:0, 0 -> 0, 0 -> 0 (24) fl 0
Interfaces
LOOP      addr: 0 netmask: 14 dfl: 0
          tx: 00000 rx: 00000 txe: 00000 rxe: 00000
          drop: 00000 autherr: 00000 frame: 00000
          txb: 0 (0B) rxb: 0 (0B)

ZMQHUB    addr: 3 netmask: 0 dfl: 1
          tx: 00000 rx: 00000 txe: 00000 rxe: 00000
          drop: 00000 autherr: 00000 frame: 00000
          txb: 0 (0B) rxb: 0 (0B)

Client task started
Ping address: 2, result 8 [mS]
reboot system request sent to address: 2