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This is a SLIP interface for the STM32F446RE Nucleo Board. It is designed to work specifically with the esp-link software for the ESP8266. The program is an example of a rest command.
main.cpp
- Committer:
- ShaneKirkbride
- Date:
- 2016-07-14
- Revision:
- 0:70a6082c1bf7
- Child:
- 1:99c58a942425
File content as of revision 0:70a6082c1bf7:
/** * 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); } }