initial commit

lib/amb1_sdk/common/example/coap/example_coap.c

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+#include "FreeRTOS.h"
+#include "task.h"
+#include "diag.h"
+#include "platform_stdlib.h"
+#include "wifi_constants.h"
+#include "wifi_conf.h"
+#include <lwip/sockets.h>
+#include <lwip/netdb.h>
+
+#include "sn_coap_protocol.h"
+#include "sn_coap_ameba_port.h"
+
+#define SERVER_HOST     "coap.me"
+#define URI_PATH        "/hello" 
+#define SERVER_PORT     5683
+#define BUF_LEN         1280 // Suggested is to keep packet size under 1280 bytes
+
+struct coap_s*          coapHandle;
+coap_version_e          coapVersion = COAP_VERSION_1;
+
+uint8_t coap_tx_cb(uint8_t *a, uint16_t b, sn_nsdl_addr_s *c, void *d) {
+  printf("coap tx cb\n");
+  return 0;
+}
+
+int8_t coap_rx_cb(sn_coap_hdr_s *a, sn_nsdl_addr_s *b, void *c) {
+  printf("coap rx cb\n");
+  return 0;
+}
+
+static void example_coap_thread(void *para){
+  
+  printf("\nCoAP Client Example\n");
+  
+  while(wifi_is_ready_to_transceive(RTW_STA_INTERFACE) != RTW_SUCCESS){
+    printf("Wait for WIFI connection ...\n");
+    vTaskDelay(1000);
+  }
+  
+  // Initialize the CoAP protocol handle, pointing to local implementations on malloc/free/tx/rx functions
+  coapHandle = coap_protocol_init(&coap_tx_cb, &coap_rx_cb);
+  
+  // See ns_coap_header.h
+  sn_coap_hdr_s *coap_res_ptr = (sn_coap_hdr_s*)coap_calloc(1*sizeof(sn_coap_hdr_s)); 
+  
+  coap_res_ptr->token_len = 0;
+  coap_res_ptr->coap_status = COAP_STATUS_OK;
+  coap_res_ptr->msg_code = COAP_MSG_CODE_REQUEST_GET;
+  coap_res_ptr->msg_type = COAP_MSG_TYPE_CONFIRMABLE;
+  coap_res_ptr->content_format = COAP_CT_TEXT_PLAIN;
+  coap_res_ptr->msg_id = 7;
+  coap_res_ptr->uri_path_len = strlen(URI_PATH);
+  coap_res_ptr->payload_len = 0;
+  coap_res_ptr->token_ptr = NULL;
+  coap_res_ptr->uri_path_ptr = (uint8_t*)URI_PATH;
+  coap_res_ptr->payload_ptr = NULL;
+  coap_res_ptr->options_list_ptr = NULL;
+  
+  
+  int socket = coap_sock_open();
+  
+  //send CoAP message
+  coap_send(SERVER_HOST, SERVER_PORT, socket, coap_res_ptr);
+  
+  coap_free(coap_res_ptr);
+  
+  //receive CoAP message
+  struct sockaddr_in from_address;
+  uint8_t* recv_buffer = (uint8_t*)coap_calloc(BUF_LEN); 
+  int ret;
+  
+  while((ret = coap_recv(socket, &from_address, recv_buffer, BUF_LEN)) >= 0)
+  {
+    uint32_t ip = from_address.sin_addr.s_addr;
+    uint8_t bytes[4];
+    bytes[0] = ip & 0xFF;
+    bytes[1] = (ip >> 8) & 0xFF;
+    bytes[2] = (ip >> 16) & 0xFF;
+    bytes[3] = (ip >> 24) & 0xFF;
+    
+    printf("\nReceived %d bytes from '%d.%d.%d.%d:%d'\n", ret, bytes[0], bytes[1], bytes[2], bytes[3], from_address.sin_port);
+    
+    sn_coap_hdr_s* parsed = sn_coap_parser(coapHandle, ret, recv_buffer, &coapVersion);
+    
+    coap_print_hdr(parsed);
+  }
+  
+  coap_free(recv_buffer);
+  
+  coap_sock_close(socket);
+    
+  vTaskDelete(NULL);
+}
+
+void example_coap(void)
+{
+  if(xTaskCreate(example_coap_thread, ((const char*)"example_coap_thread"), 2048, NULL, tskIDLE_PRIORITY + 1, NULL) != pdPASS)
+    printf("\n\r%s xTaskCreate(init_thread) failed", __FUNCTION__);
+}

lib/amb1_sdk/common/example/coap/example_coap.h

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+#ifndef EXAMPLE_COAP_H
+#define EXAMPLE_COAP_H
+
+void example_coap(void);
+
+#endif /* EXAMPLE_COAP_H */

lib/amb1_sdk/common/example/coap/readme.txt

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+This example demonstrates how to use mbed-CoAP C library to build and parse a CoAP message.
+
+In the example, a confirmable GET request is send to test server "coap.me" to retrieve the resource under path "/hello". The expected return is an ACK message with payload "world".
+
+Note:
+Company Firewall may block CoAP message. You can use copper (https://addons.mozilla.org/en-US/firefox/addon/copper-270430/) to test the server's reachability.