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 "FATFileSystem.h"
00022 
00023 // An event queue is a very useful structure to debounce information between contexts (e.g. ISR and normal threads)
00024 // 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
00025 EventQueue eventQueue;
00026 
00027 // Default block device
00028 BlockDevice* bd = BlockDevice::get_default_instance();
00029 FATFileSystem fs("sd", bd);
00030 
00031 // Default network interface object
00032 NetworkInterface *net;
00033 
00034 // Declaring pointers for access to Pelion Device Management Client resources outside of main()
00035 MbedCloudClientResource *button_res;
00036 MbedCloudClientResource *pattern_res;
00037 
00038 // This function gets triggered by the timer. It's easy to replace it by an InterruptIn and fall() mode on a real button
00039 void fake_button_press() {
00040     int v = button_res->get_value_int() + 1;
00041 
00042     button_res->set_value(v);
00043 
00044     printf("Simulated button clicked %d times\n", v);
00045 }
00046 
00047 /**
00048  * PUT handler
00049  * @param resource The resource that triggered the callback
00050  * @param newValue Updated value for the resource
00051  */
00052 void pattern_updated(MbedCloudClientResource *resource, m2m::String newValue) {
00053     printf("PUT received, new value: %s\n", newValue.c_str());
00054 }
00055 
00056 /**
00057  * POST handler
00058  * @param resource The resource that triggered the callback
00059  * @param buffer If a body was passed to the POST function, this contains the data.
00060  *               Note that the buffer is deallocated after leaving this function, so copy it if you need it longer.
00061  * @param size Size of the body
00062  */
00063 void blink_callback(MbedCloudClientResource *resource, const uint8_t *buffer, uint16_t size) {
00064     printf("POST received. Going to blink LED pattern: %s\n", pattern_res->get_value().c_str());
00065 
00066     static DigitalOut augmentedLed(LED1); // LED that is used for blinking the pattern
00067 
00068     // Parse the pattern string, and toggle the LED in that pattern
00069     string s = std::string(pattern_res->get_value().c_str());
00070     size_t i = 0;
00071     size_t pos = s.find(':');
00072     while (pos != string::npos) {
00073         wait_ms(atoi(s.substr(i, pos - i).c_str()));
00074         augmentedLed = !augmentedLed;
00075 
00076         i = ++pos;
00077         pos = s.find(':', pos);
00078 
00079         if (pos == string::npos) {
00080             wait_ms(atoi(s.substr(i, s.length()).c_str()));
00081             augmentedLed = !augmentedLed;
00082         }
00083     }
00084 }
00085 
00086 /**
00087  * Notification callback handler
00088  * @param resource The resource that triggered the callback
00089  * @param status The delivery status of the notification
00090  */
00091 void button_callback(MbedCloudClientResource *resource, const NoticationDeliveryStatus status) {
00092     printf("Button notification, status %s (%d)\n", MbedCloudClientResource::delivery_status_to_string(status), status);
00093 }
00094 
00095 /**
00096  * Registration callback handler
00097  * @param endpoint Information about the registered endpoint such as the name (so you can find it back in portal)
00098  */
00099 void registered(const ConnectorClientEndpointInfo *endpoint) {
00100     printf("Connected to Pelion Device Management. Endpoint Name: %s\n", endpoint->internal_endpoint_name.c_str());
00101 }
00102 
00103 int main(void) {
00104     printf("Starting Simple Pelion Device Management Client example\n");
00105     printf("Connecting to the network...\n");
00106 
00107     // Connect to the internet (DHCP is expected to be on)
00108     net = NetworkInterface::get_default_instance();
00109 
00110     nsapi_error_t status = net->connect();
00111 
00112     if (status != NSAPI_ERROR_OK) {
00113         printf("Connecting to the network failed %d!\n", status);
00114         return -1;
00115     }
00116 
00117     printf("Connected to the network successfully. IP address: %s\n", net->get_ip_address());
00118 
00119     // SimpleMbedCloudClient handles registering over LwM2M to Pelion Device Management
00120     SimpleMbedCloudClient client(net, bd, &fs);
00121     int client_status = client.init();
00122     if (client_status != 0) {
00123         printf("Pelion Client initialization failed (%d)\n", client_status);
00124         return -1;
00125     }
00126 
00127     // Creating resources, which can be written or read from the cloud
00128     button_res = client.create_resource("3200/0/5501", "button_count");
00129     button_res->set_value(0);
00130     button_res->methods(M2MMethod::GET);
00131     button_res->observable(true);
00132     button_res->attach_notification_callback(button_callback);
00133 
00134     pattern_res = client.create_resource("3201/0/5853", "blink_pattern");
00135     pattern_res->set_value("500:500:500:500:500:500:500:500");
00136     pattern_res->methods(M2MMethod::GET | M2MMethod::PUT);
00137     pattern_res->attach_put_callback(pattern_updated);
00138 
00139     MbedCloudClientResource *blink_res = client.create_resource("3201/0/5850", "blink_action");
00140     blink_res->methods(M2MMethod::POST);
00141     blink_res->attach_post_callback(blink_callback);
00142 
00143     printf("Initialized Pelion Client. Registering...\n");
00144 
00145     // Callback that fires when registering is complete
00146     client.on_registered(&registered);
00147 
00148     // Register with Pelion Device Management
00149     client.register_and_connect();
00150 
00151     // Placeholder for callback to update local resource when GET comes.
00152     // The timer fires on an interrupt context, but debounces it to the eventqueue, so it's safe to do network operations
00153     Ticker timer;
00154     timer.attach(eventQueue.event(&fake_button_press), 5.0);
00155 
00156     // You can easily run the eventQueue in a separate thread if required
00157     eventQueue.dispatch_forever();
00158 }