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 Thread thread1;
00027 
00028 // Default block device
00029 BlockDevice* bd = BlockDevice::get_default_instance();
00030 FATFileSystem fs("sd", bd);
00031 
00032 // Default network interface object
00033 NetworkInterface *net;
00034  
00035 InterruptIn sw2(SW2);
00036 DigitalOut led2(LED2);
00037 
00038 // Declaring pointers for access to Mbed Cloud Client resources outside of main()
00039 MbedCloudClientResource *button_res;
00040 MbedCloudClientResource *pattern_res;
00041 
00042 static bool button_pressed = false;
00043 static int button_count = 0;
00044       
00045 void button_press() {
00046     button_pressed = true;
00047     ++button_count;
00048     button_res->set_value(button_count);
00049 }
00050 
00051 /**
00052  * PUT handler
00053  * @param resource The resource that triggered the callback
00054  * @param newValue Updated value for the resource
00055  */
00056 void pattern_updated(MbedCloudClientResource *resource, m2m::String newValue) {
00057     printf("PUT received, new value: %s\n", newValue.c_str());
00058 }
00059 
00060 /**
00061  * POST handler
00062  * @param resource The resource that triggered the callback
00063  * @param buffer If a body was passed to the POST function, this contains the data.
00064  *               Note that the buffer is deallocated after leaving this function, so copy it if you need it longer.
00065  * @param size Size of the body
00066  */
00067 void blink_callback(MbedCloudClientResource *resource, const uint8_t *buffer, uint16_t size) {
00068     printf("POST received. Going to blink LED pattern: %s\n", pattern_res->get_value().c_str());
00069 
00070     static DigitalOut augmentedLed(LED1); // LED that is used for blinking the pattern
00071 
00072     // Parse the pattern string, and toggle the LED in that pattern
00073     string s = std::string(pattern_res->get_value().c_str());
00074     size_t i = 0;
00075     size_t pos = s.find(':');
00076     while (pos != string::npos) {
00077         wait_ms(atoi(s.substr(i, pos - i).c_str()));
00078         augmentedLed = !augmentedLed;
00079 
00080         i = ++pos;
00081         pos = s.find(':', pos);
00082 
00083         if (pos == string::npos) {
00084             wait_ms(atoi(s.substr(i, s.length()).c_str()));
00085             augmentedLed = !augmentedLed;
00086         }
00087     }
00088 }
00089 
00090 /**
00091  * Notification callback handler
00092  * @param resource The resource that triggered the callback
00093  * @param status The delivery status of the notification
00094  */
00095 void button_callback(MbedCloudClientResource *resource, const NoticationDeliveryStatus status) {
00096     printf("Button notification, status %s (%d)\n", MbedCloudClientResource::delivery_status_to_string(status), status);
00097 }
00098 
00099 /**
00100  * Registration callback handler
00101  * @param endpoint Information about the registered endpoint such as the name (so you can find it back in portal)
00102  */
00103 void registered(const ConnectorClientEndpointInfo *endpoint) {
00104     printf("Connected to Mbed Cloud. Endpoint Name: %s\n", endpoint->internal_endpoint_name.c_str());
00105 }
00106 
00107 int main(void) {
00108     printf("Starting Simple Mbed Cloud Client example\n");
00109     printf("Connecting to the network using Ethernet...\n");
00110 
00111     // Connect to the internet (DHCP is expected to be on)
00112     net = NetworkInterface::get_default_instance();
00113 
00114     nsapi_error_t status = net->connect();
00115 
00116     if (status != NSAPI_ERROR_OK) {
00117         printf("Connecting to the network failed %d!\n", status);
00118         return -1;
00119     }
00120 
00121     printf("Connected to the network successfully. IP address: %s\n", net->get_ip_address());
00122 
00123     // SimpleMbedCloudClient handles registering over LwM2M to Mbed Cloud
00124     SimpleMbedCloudClient client(net, bd, &fs);
00125     int client_status = client.init();
00126     if (client_status != 0) {
00127         printf("Initializing Mbed Cloud Client failed (%d)\n", client_status);
00128         return -1;
00129     }
00130 
00131     // Creating resources, which can be written or read from the cloud
00132     button_res = client.create_resource("3200/0/5501", "button_count");
00133     button_res->set_value(0);
00134     button_res->methods(M2MMethod::GET);
00135     button_res->observable(true);
00136     button_res->attach_notification_callback(button_callback);
00137 
00138     pattern_res = client.create_resource("3201/0/5853", "blink_pattern");
00139     pattern_res->set_value("500:500:500:500:500:500:500:500");
00140     pattern_res->methods(M2MMethod::GET | M2MMethod::PUT);
00141     pattern_res->attach_put_callback(pattern_updated);
00142 
00143     MbedCloudClientResource *blink_res = client.create_resource("3201/0/5850", "blink_action");
00144     blink_res->methods(M2MMethod::POST);
00145     blink_res->attach_post_callback(blink_callback);
00146 
00147     printf("Initialized Mbed Cloud Client. Registering...\n");
00148 
00149     // Callback that fires when registering is complete
00150     client.on_registered(&registered);
00151 
00152     // Register with Mbed Cloud
00153     client.register_and_connect();
00154 
00155     // Setup the button 
00156       sw2.mode(PullUp);
00157     
00158     // The button fall handler is placed in the event queue so it will run in
00159     // thread context instead of ISR context, which allows safely updating the cloud resource         
00160       sw2.fall(eventQueue.event(&button_press));
00161       button_count = 0;
00162 
00163     // Start the event queue in a separate thread so the main thread continues
00164     thread1.start(callback(&eventQueue, &EventQueue::dispatch_forever));
00165 
00166     while(1)
00167     {
00168         wait_ms(100);
00169 
00170         if (button_pressed) {
00171             button_pressed = false;
00172             printf("button clicked %d times\r\n", button_count);            
00173         }
00174         
00175     }
00176 }