Revision 0:0681e205d0e9, committed 2017-02-15

Comitter:

Jan Jongboom

Date:

Wed Feb 15 21:18:58 2017 +0100

Commit message:

Initial commit

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.gitignore	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,6 @@
+.mbed
+.vscode/
+mbed_settings.*
+BUILD/
+.build/
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgignore	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,9 @@
+.mbed
+.vscode/
+mbed_settings.*
+BUILD/
+.build/
+mbed-os/
+easy-connect/
+.git/
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LICENSE	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,165 @@
+Apache License
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+http://www.apache.org/licenses/
+
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/README.md	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,10 @@
+# mbed-os-example-coap
+
+This application demonstrates how to connect to a CoAP server from mbed OS 5. It connects to coap://coap.me, sends a message to `/hello` and receives the response.
+
+## To build
+
+1. Open ``mbed_app.json`` and change the `network-interface` option to your connectivity method ([more info](https://github.com/ARMmbed/easy-connect)).
+2. Build the project in the online compiler or using mbed CLI.
+3. Flash the project to your development board.
+4. Attach a serial monitor to your board to see the debug messages.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/easy-connect.lib	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/easy-connect/#a913964341394430cd3997c6f2950f93ba1d75c8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#269f58d75b752a4e67a6a2d8c5c698635ffd6752

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_app.json	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,78 @@
+{
+    "config": {
+        "network-interface":{
+            "help": "options are ETHERNET, WIFI_ESP8266, WIFI_ODIN, MESH_LOWPAN_ND, MESH_THREAD",
+            "value": "ETHERNET"
+        },
+        "mesh_radio_type": {
+        	"help": "options are ATMEL, MCR20",
+        	"value": "ATMEL"
+        },
+        "esp8266-tx": {
+            "help": "Pin used as TX (connects to ESP8266 RX)",
+            "value": "D1"
+        },
+        "esp8266-rx": {
+            "help": "Pin used as RX (connects to ESP8266 TX)",
+            "value": "D0"
+        },
+        "esp8266-debug": {
+            "value": true
+        },
+        "wifi-ssid": {
+            "value": "\"SSID\""
+        },
+        "wifi-password": {
+            "value": "\"Password\""
+        },
+        "button": {
+            "help": "Pin which you'll use as button (can be overriden per target below)",
+            "value": "BUTTON1"
+        },
+        "builtin_led_on": {
+            "help": "Value to write to built-in LEDs to turn them on",
+            "value": 1,
+            "macro_name": "BUILTIN_LED_ON"
+        },
+        "builtin_led_off": {
+            "help": "Value to write to built-in LEDs to turn them off",
+            "value": 0,
+            "macro_name": "BUILTIN_LED_OFF"
+        }
+    },
+    "target_overrides": {
+        "*": {
+            "target.features_add": ["NANOSTACK", "LOWPAN_ROUTER", "COMMON_PAL"],
+            "platform.stdio-baud-rate": 115200,
+            "platform.stdio-convert-newlines": true,
+            "mbed-mesh-api.6lowpan-nd-channel-page": 0,
+            "mbed-mesh-api.6lowpan-nd-channel": 12,
+            "mbed-trace.enable": 0
+        },
+        "K64F": {
+            "button": "SW2",
+            "builtin_led_on": 0,
+            "builtin_led_off": 1
+        },
+        "HEXIWEAR": {
+            "button": "PTA12",
+            "esp8266-tx": "PTD3",
+            "esp8266-rx": "PTD2"
+        },
+        "NUCLEO_F401RE": {
+            "button": "USER_BUTTON",
+            "esp8266-tx": "D8",
+            "esp8266-rx": "D2"
+        },
+        "NUCLEO_F411RE": {
+            "button": "USER_BUTTON",
+            "esp8266-tx": "D8",
+            "esp8266-rx": "D2"
+        },
+        "NUMAKER_PFM_NUC472": {
+            "button": "SW1",
+            "builtin_led_on": 0,
+            "builtin_led_off": 1
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/main.cpp	Wed Feb 15 21:18:58 2017 +0100
@@ -0,0 +1,136 @@
+/*
+ * PackageLicenseDeclared: Apache-2.0
+ * Copyright (c) 2017 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <string>
+#include "mbed.h"
+#include "easy-connect.h"
+#include "sn_nsdl.h"
+#include "sn_coap_protocol.h"
+#include "sn_coap_header.h"
+
+UDPSocket socket;           // Socket to talk CoAP over
+Thread recvfromThread;      // Thread to receive messages over CoAP
+
+struct coap_s* coapHandle;
+coap_version_e coapVersion = COAP_VERSION_1;
+
+// CoAP HAL
+void* coap_malloc(uint16_t size) {
+    return malloc(size);
+}
+
+void coap_free(void* addr) {
+    free(addr);
+}
+
+// tx_cb and rx_cb are not used in this program
+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;
+}
+
+// Main function for the recvfrom thread
+void recvfromMain() {
+    SocketAddress addr;
+    uint8_t* recv_buffer = (uint8_t*)malloc(1280); // Suggested is to keep packet size under 1280 bytes
+
+    nsapi_size_or_error_t ret;
+
+    while ((ret = socket.recvfrom(&addr, recv_buffer, 1280)) >= 0) {
+        // to see where the message came from, inspect addr.get_addr() and addr.get_port()
+
+        printf("Received a message of length '%d'\n", ret);
+
+        sn_coap_hdr_s* parsed = sn_coap_parser(coapHandle, ret, recv_buffer, &coapVersion);
+
+        // We know the payload is going to be a string
+        std::string payload((const char*)parsed->payload_ptr, parsed->payload_len);
+
+        printf("\tmsg_id:           %d\n", parsed->msg_id);
+        printf("\tmsg_code:         %d\n", parsed->msg_code);
+        printf("\tcontent_format:   %d\n", parsed->content_format);
+        printf("\tpayload_len:      %d\n", parsed->payload_len);
+        printf("\tpayload:          %s\n", payload.c_str());
+        printf("\toptions_list_ptr: %p\n", parsed->options_list_ptr);
+    }
+
+    free(recv_buffer);
+
+    printf("UDPSocket::recvfrom failed, error code %d. Shutting down receive thread.\n", ret);
+}
+
+int main() {
+    NetworkInterface *network = easy_connect(true);
+    if (!network) {
+        printf("Cannot connect to the network, see serial output");
+        return 1;
+    }
+
+    printf("Connected to the network. Opening a socket...\n");
+
+    // Open a socket on the network interface
+    socket.open(network);
+
+    // Initialize the CoAP protocol handle, pointing to local implementations on malloc/free/tx/rx functions
+    coapHandle = sn_coap_protocol_init(&coap_malloc, &coap_free, &coap_tx_cb, &coap_rx_cb);
+
+    // UDPSocket::recvfrom is blocking, so run it in a separate RTOS thread
+    recvfromThread.start(&recvfromMain);
+
+    // Path to the resource we want to retrieve
+    const char* coap_uri_path = "/hello";
+
+    // See ns_coap_header.h
+    sn_coap_hdr_s *coap_res_ptr = (sn_coap_hdr_s*)calloc(sizeof(sn_coap_hdr_s), 1);
+    coap_res_ptr->uri_path_ptr = (uint8_t*)coap_uri_path;       // Path
+    coap_res_ptr->uri_path_len = strlen(coap_uri_path);
+    coap_res_ptr->msg_code = COAP_MSG_CODE_REQUEST_GET;         // CoAP method
+    coap_res_ptr->content_format = COAP_CT_TEXT_PLAIN;          // CoAP content type
+    coap_res_ptr->payload_len = 0;                              // Body length
+    coap_res_ptr->payload_ptr = 0;                              // Body pointer
+    coap_res_ptr->options_list_ptr = 0;                         // Optional: options list
+    // Message ID is used to track request->response patterns, because we're using UDP (so everything is unconfirmed).
+    // See the receive code to verify that we get the same message ID back
+    coap_res_ptr->msg_id = 7;
+
+    // Calculate the CoAP message size, allocate the memory and build the message
+    uint16_t message_len = sn_coap_builder_calc_needed_packet_data_size(coap_res_ptr);
+    printf("Calculated message length: %d bytes\n", message_len);
+
+    uint8_t* message_ptr = (uint8_t*)malloc(message_len);
+    sn_coap_builder(message_ptr, coap_res_ptr);
+
+    // Uncomment to see the raw buffer that will be sent...
+    // printf("Message is: ");
+    // for (size_t ix = 0; ix < message_len; ix++) {
+    //     printf("%02x ", message_ptr[ix]);
+    // }
+    // printf("\n");
+
+    int scount = socket.sendto("coap.me", 5683, message_ptr, message_len);
+    printf("Sent %d bytes to coap://coap.me:5683\n", scount);
+
+    free(coap_res_ptr);
+    free(message_ptr);
+
+    Thread::wait(osWaitForever);
+}