main.cpp

00001 // ----------------------------------------------------------------------------
00002 // Copyright 2016-2018 ARM Ltd.
00003 //
00004 // SPDX-License-Identifier: Apache-2.0
00005 //
00006 // Licensed under the Apache License, Version 2.0 (the "License");
00007 // you may not use this file except in compliance with the License.
00008 // You may obtain a copy of the License at
00009 //
00010 //     http://www.apache.org/licenses/LICENSE-2.0
00011 //
00012 // Unless required by applicable law or agreed to in writing, software
00013 // distributed under the License is distributed on an "AS IS" BASIS,
00014 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00015 // See the License for the specific language governing permissions and
00016 // limitations under the License.
00017 // ----------------------------------------------------------------------------
00018 
00019 #include "mbed.h"
00020 #include "simple-mbed-cloud-client.h"
00021 #include "SDBlockDevice.h"
00022 #include "FATFileSystem.h"
00023 #include "EthernetInterface.h"
00024 
00025 // An event queue is a very useful structure to debounce information between contexts (e.g. ISR and normal threads)
00026 // This is great because things such as network operations are illegal in ISR, so updating a resource in a button's fall() function is not allowed
00027 EventQueue eventQueue;
00028 
00029 // Storage implementation definition, currently using SDBlockDevice (SPI flash, DataFlash, and internal flash are also available)
00030 SDBlockDevice bd(MBED_CONF_APP_SPI_MOSI, MBED_CONF_APP_SPI_MISO, MBED_CONF_APP_SPI_CLK, MBED_CONF_APP_SPI_CS);
00031 FATFileSystem fs("sd", &bd);
00032 
00033 // Declaring pointers for access to Mbed Cloud Client resources outside of main()
00034 MbedCloudClientResource *button_res;
00035 MbedCloudClientResource *pattern_res;
00036 
00037 // This function gets triggered by the timer. It's easy to replace it by an InterruptIn and fall() mode on a real button
00038 void fake_button_press() {
00039     int v = button_res->get_value_int() + 1;
00040 
00041     button_res->set_value(v);
00042 
00043     printf("Simulated button clicked %d times\n", v);
00044 }
00045 
00046 /**
00047  * PUT handler
00048  * @param resource The resource that triggered the callback
00049  * @param newValue Updated value for the resource
00050  */
00051 void pattern_updated(MbedCloudClientResource *resource, m2m::String newValue) {
00052     printf("PUT received, new value: %s\n", newValue.c_str());
00053 }
00054 
00055 /**
00056  * POST handler
00057  * @param resource The resource that triggered the callback
00058  * @param buffer If a body was passed to the POST function, this contains the data.
00059  *               Note that the buffer is deallocated after leaving this function, so copy it if you need it longer.
00060  * @param size Size of the body
00061  */
00062 void blink_callback(MbedCloudClientResource *resource, const uint8_t *buffer, uint16_t size) {
00063     printf("POST received. Going to blink LED pattern: %s\n", pattern_res->get_value().c_str());
00064 
00065     static DigitalOut augmentedLed(LED1); // LED that is used for blinking the pattern
00066 
00067     // Parse the pattern string, and toggle the LED in that pattern
00068     string s = std::string(pattern_res->get_value().c_str());
00069     size_t i = 0;
00070     size_t pos = s.find(':');
00071     while (pos != string::npos) {
00072         wait_ms(atoi(s.substr(i, pos - i).c_str()));
00073         augmentedLed = !augmentedLed;
00074 
00075         i = ++pos;
00076         pos = s.find(':', pos);
00077 
00078         if (pos == string::npos) {
00079             wait_ms(atoi(s.substr(i, s.length()).c_str()));
00080             augmentedLed = !augmentedLed;
00081         }
00082     }
00083 }
00084 
00085 /**
00086  * Notification callback handler
00087  * @param resource The resource that triggered the callback
00088  * @param status The delivery status of the notification
00089  */
00090 void button_callback(MbedCloudClientResource *resource, const NoticationDeliveryStatus status) {
00091     printf("Button notification, status %s (%d)\n", MbedCloudClientResource::delivery_status_to_string(status), status);
00092 }
00093 
00094 /**
00095  * Registration callback handler
00096  * @param endpoint Information about the registered endpoint such as the name (so you can find it back in portal)
00097  */
00098 void registered(const ConnectorClientEndpointInfo *endpoint) {
00099     printf("Connected to Mbed Cloud. Endpoint Name: %s\n", endpoint->internal_endpoint_name.c_str());
00100 }
00101 
00102 int main(void) {
00103     printf("Starting Simple Mbed Cloud Client example\n");
00104     printf("Connecting to the network using Ethernet...\n");
00105 
00106     // Connect to the internet (DHCP is expected to be on)
00107     EthernetInterface net;
00108     nsapi_error_t status = net.connect();
00109 
00110     if (status != 0) {
00111         printf("Connecting to the network failed %d!\n", status);
00112         return -1;
00113     }
00114 
00115     printf("Connected to the network successfully. IP address: %s\n", net.get_ip_address());
00116 
00117     // SimpleMbedCloudClient handles registering over LwM2M to Mbed Cloud
00118     SimpleMbedCloudClient client(&net, &bd, &fs);
00119     int client_status = client.init();
00120     if (client_status != 0) {
00121         printf("Initializing Mbed Cloud Client failed (%d)\n", client_status);
00122         return -1;
00123     }
00124 
00125     // Creating resources, which can be written or read from the cloud
00126     button_res = client.create_resource("3200/0/5501", "button_count");
00127     button_res->set_value(0);
00128     button_res->methods(M2MMethod::GET);
00129     button_res->observable(true);
00130     button_res->attach_notification_callback(button_callback);
00131 
00132     pattern_res = client.create_resource("3201/0/5853", "blink_pattern");
00133     pattern_res->set_value("500:500:500:500:500:500:500:500");
00134     pattern_res->methods(M2MMethod::GET | M2MMethod::PUT);
00135     pattern_res->attach_put_callback(pattern_updated);
00136 
00137     MbedCloudClientResource *blink_res = client.create_resource("3201/0/5850", "blink_action");
00138     blink_res->methods(M2MMethod::POST);
00139     blink_res->attach_post_callback(blink_callback);
00140 
00141     printf("Initialized Mbed Cloud Client. Registering...\n");
00142 
00143     // Callback that fires when registering is complete
00144     client.on_registered(&registered);
00145 
00146     // Register with Mbed Cloud
00147     client.register_and_connect();
00148 
00149     // Placeholder for callback to update local resource when GET comes.
00150     // The timer fires on an interrupt context, but debounces it to the eventqueue, so it's safe to do network operations
00151     Ticker timer;
00152     timer.attach(eventQueue.event(&fake_button_press), 5.0);
00153 
00154     // You can easily run the eventQueue in a separate thread if required
00155     eventQueue.dispatch_forever();
00156 }