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Add CoAP server example doc. Closes cesanta/dev#4917

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Alexander Alashkin 2016-09-29 13:34:53 +02:00 committed by Cesanta Bot
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docs/coap/server_example.md
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title: CoAP server example title: CoAP server example
--- ---
TBD To create a CoAP server, follow this pattern:
1. Create a listening connection by calling `mg_bind()` or `mg_bind_opt()`
2. 2. Call `mg_set_protocol_coap()` for that listening connection.
3. Create an event handler function that handles the following events:
- `MG_EV_COAP_CON`
- `MG_EV_COAP_NOC`
- `MG_EV_COAP_ACK`
- `MG_EV_COAP_RST`
Here's an example of the simplest CoAP server. Error checking is omitted for the sake of clarity:
```c
#include "mongoose.h"
static char *s_default_address = "udp://:5683";
static void coap_handler(struct mg_connection *nc, int ev, void *p) {
switch (ev) {
case MG_EV_COAP_CON: {
uint32_t res;
struct mg_coap_message *cm = (struct mg_coap_message *) p;
printf("CON with msg_id = %d received\n", cm->msg_id);
res = mg_coap_send_ack(nc, cm->msg_id);
if (res == 0) {
printf("Successfully sent ACK for message with msg_id = %d\n",
cm->msg_id);
} else {
printf("Error: %d\n", res);
}
break;
}
case MG_EV_COAP_NOC:
case MG_EV_COAP_ACK:
case MG_EV_COAP_RST: {
struct mg_coap_message *cm = (struct mg_coap_message *) p;
printf("ACK/RST/NOC with msg_id = %d received\n", cm->msg_id);
break;
}
}
}
int main(void) {
struct mg_mgr mgr;
struct mg_connection *nc;
mg_mgr_init(&mgr, 0);
nc = mg_bind(&mgr, s_default_address, coap_handler);
mg_set_protocol_coap(nc);
while (1) {
mg_mgr_poll(&mgr, 1000);
}
mg_mgr_free(&mgr);
return 0;
}
```
See full source code at [CoAP server example](https://github.com/cesanta/mongoose/tree/master/examples/coap_server).