Diff: main.cpp

Revision:

0:70a6082c1bf7

Child:

1:99c58a942425

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jul 14 20:38:18 2016 +0000
@@ -0,0 +1,139 @@
+/**
+ * Simple example to demo the STM-Client REST calls
+ */
+#include "mbed.h"
+#include <STMClient.h>
+#include <STMClientRest.h>
+
+/*-------- Check if platform compatible ----------*/
+#if DEVICE_SERIAL_ASYNCH
+Serial debugSerial(SERIAL_TX, SERIAL_RX);
+Serial espSerial(PA_0, PA_1);
+#else
+    #warning "Platform not compatible with Low Power APIs for Serial"
+    Serial debugSerial(SERIAL_TX, SERIAL_RX);
+    Serial espSerial(PA_0, PA_1);
+#endif
+
+
+DigitalOut led1(LED1);             
+
+// Initialize a connection to esp-link using the normal hardware serial port both for
+// SLIP and for debug messages.
+STMClient esp(&espSerial, &debugSerial);
+
+
+// Initialize a REST client on the connection to esp-link
+STMClientRest rest(&esp);
+
+bool wifiConnected = false;
+
+// Callback made from esp-link to notify of wifi status changes
+// Here we print something out and set a global flag
+void wifiCb(void *response) {
+  debugSerial.printf("waiting for wifi status...\n\r"); //debug
+  STMClientResponse *res = (STMClientResponse*)response;
+  if (res->argc() == 1) {
+    uint8_t status;
+    res->popArg(&status, 1);
+    debugSerial.printf("waiting for wifi status...\n\r");
+    if(status == STATION_GOT_IP) {
+      debugSerial.printf("WIFI CONNECTED");
+      wifiConnected = true;
+    } else {
+      debugSerial.printf("WIFI NOT READY: %i",status);
+      //Serial.printf(status);
+      wifiConnected = false;
+    }
+  }
+}
+
+#define BUFLEN 266
+
+int loop() {
+  //debugSerial.printf("begin main loop \n\r");
+  // process any callbacks coming from esp_link
+  esp.Process();
+  debugSerial.printf("Wifi Connected: %i \n\r",wifiConnected);
+  // if we're connected make an HTTP request
+  while(wifiConnected) {
+    // Request /utc/now from the previously set-up server
+    rest.get("/utc/now");
+
+    char response[BUFLEN];
+    memset(response, 0, BUFLEN);
+    uint16_t code = rest.waitResponse(response, BUFLEN);
+    if(code == HTTP_STATUS_OK){
+      debugSerial.printf("STM: GET successful: %s\n\r", response);
+    } else {
+      debugSerial.printf("STM: GET failed: %i\n\r",code);
+      return code;
+    }
+    wait(1);
+  }
+  return 0; 
+  
+}
+
+int main() {
+  led1=0;
+  debugSerial.baud(115200);   // the baud rate here needs to match the esp-link config
+  espSerial.baud(115200);
+  
+  debugSerial.printf("STM-Client starting!\n\r");
+  wait(0.5);
+  
+  espSerial.printf("STM-Client starting!\n\r");
+  wait(0.5);
+
+  // Sync-up with esp-link, this is required at the start of any sketch and initializes the
+  // callbacks to the wifi status change callback. The callback gets called with the initial
+  // status right after Sync() below completes.
+  esp.wifiCb.attach(wifiCb); // wifi status change callback, optional (delete if not desired)
+  bool ok;
+  do {
+      //debugSerial.printf("main syncing..\n\r");
+      wait(0.5);
+    ok = esp.Sync();      // sync up with esp-link, blocks for up to 2 seconds
+    if (!ok){ 
+        debugSerial.printf("STM-Client sync failed!\n\r");
+        wait(0.5);
+        }
+  } while(!ok);
+  
+  debugSerial.printf("STM-Client synced!\n\r");
+
+  // Get immediate wifi status info for demo purposes. This is not normally used because the
+  // wifi status callback registered above gets called immediately. 
+  esp.GetWifiStatus();
+  STMClientPacket *packet;
+  if ((packet=esp.WaitReturn()) != NULL) 
+  {
+    //debugSerial.printf("Wifi status: %i\n\r", packet->value);
+    //debugSerial.printf("waiting for wifi status...\n\r");
+    if(packet->value == 2) { ///ideally this would coincide with STATION_GOT_IP... 
+      debugSerial.printf("WIFI CONNECTED\n\r");
+      wifiConnected = true;
+    } else {
+      debugSerial.printf("WIFI NOT READY: %i\n\r",packet->value);
+      //Serial.printf(status);
+      wifiConnected = false;
+    }
+  }
+  
+
+  // Set up the REST client to talk to www.timeapi.org, this doesn't connect to that server,
+  // it just sets-up stuff on the esp-link side
+  int err = rest.begin("www.timeapi.org");
+  if (err != 0) {
+    debugSerial.printf("REST begin failed: %i\n\r",err);
+    while(1) ;
+  }
+  debugSerial.printf("STM-REST ready\n\r");
+  int loopStat = 0;
+  while(loopStat == 0){
+      debugSerial.printf("status: %i\n\r",loopStat);
+      loopStat = loop();
+      wait(1);
+    } 
+}
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