main.cpp

00001 #include "mbed.h"
00002 #include "security.h"
00003 #include "easy-connect.h"
00004 #include "simple-mbed-client.h"
00005 
00006 SimpleMbedClient client;
00007 
00008 // Declare peripherals
00009 DigitalOut connectivityLed(LED2);                   // Blinks while connecting, turns solid when connected
00010 DigitalOut augmentedLed(LED1, BUILTIN_LED_OFF);     // LED that can be controlled through Connector
00011 InterruptIn btn(MBED_CONF_APP_BUTTON);              // Button that sends it's count to Connector
00012 
00013 Ticker connectivityTicker;
00014 
00015 // Callback function when the pattern resource is updated
00016 void patternUpdated(string v) {
00017     printf("New pattern: %s\n", v.c_str());
00018 }
00019 
00020 // Define resources here. They act as normal variables, but are exposed to the internet...
00021 SimpleResourceInt btn_count = client.define_resource("button/0/clicks", 0, M2MBase::GET_ALLOWED);
00022 SimpleResourceString pattern = client.define_resource("led/0/pattern", "500:500:500:500:500:500:500", &patternUpdated);
00023 
00024 void fall() {
00025     btn_count = btn_count + 1;
00026     printf("Button count is now %d\r\n", static_cast<int>(btn_count));
00027 }
00028 
00029 void toggleConnectivityLed() {
00030     connectivityLed = !connectivityLed;
00031 }
00032 
00033 void registered() {
00034     printf("Registered\r\n");
00035 
00036     connectivityTicker.detach();
00037     connectivityLed = BUILTIN_LED_ON;
00038 }
00039 
00040 void play(void* args) {
00041     connectivityLed = BUILTIN_LED_OFF;
00042 
00043     // Parse the pattern string, and toggle the LED in that pattern
00044     string s = static_cast<string>(pattern);
00045     size_t i = 0;
00046     size_t pos = s.find(':');
00047     while (pos != string::npos) {
00048         wait_ms(atoi(s.substr(i, pos - i).c_str()));
00049         augmentedLed = !augmentedLed;
00050 
00051         i = ++pos;
00052         pos = s.find(':', pos);
00053 
00054         if (pos == string::npos) {
00055             wait_ms(atoi(s.substr(i, s.length()).c_str()));
00056             augmentedLed = !augmentedLed;
00057         }
00058     }
00059 
00060     augmentedLed = BUILTIN_LED_OFF;
00061     connectivityLed = BUILTIN_LED_ON;
00062 }
00063 
00064 int main() {
00065     // SimpleClient gives us an event queue which we can use, running on a separate thread (see https://docs.mbed.com/docs/mbed-os-handbook/en/5.1/concepts/events/)
00066     EventQueue* eventQueue = client.eventQueue();
00067 
00068     // Handle interrupts on the eventQueue - so we don't do things in interrupt context
00069     btn.fall(eventQueue->event(&fall));
00070 
00071     // Toggle the built-in LED every second (until we're connected, see `registered` function)
00072     connectivityTicker.attach(eventQueue->event(&toggleConnectivityLed), 1.0f);
00073 
00074     // Functions can be executed through mbed Device Connector via POST calls (also defer to the event thread, so we never block)
00075     client.define_function("led/0/play", eventQueue->event(&play));
00076 
00077     // Connect to the internet (see mbed_app.json for the connectivity method)
00078     NetworkInterface* network = easy_connect(true);
00079     if (!network) {
00080         return 1;
00081     }
00082 
00083     // Connect to mbed Device Connector
00084     struct MbedClientOptions opts = client.get_default_options(); // opts contains information like the DeviceType
00085     bool setup = client.setup(opts, network);
00086     if (!setup) {
00087         printf("Client setup failed\n");
00088         return 1;
00089     }
00090     client.on_registered(&registered);
00091 }