Hi there, I have tried to get the data on thingspeak via integrating it on the things Network. but the GPS data I am receiving on the thingspeak is delayed by 2 mins. is there any way I can code to send JSON file straight on thingspeak from the sensor or the gateway? Following is the ardiuno sketch #include <lmic.h> #include <hal/hal.h> #include <SPI.h> #include <SoftwareSerial.h> #include <TinyGPS.h> TinyGPS gps; SoftwareSerial ss(3, 4); // Arduino RX, TX to conenct to GPS module. static void smartdelay(unsigned long ms); unsigned int count = 1; //For times count String datastring1=""; String datastring2=""; String datastring3=""; uint8_t datasend[20]; //Used to store GPS data for uploading char gps_lon[20]={"\0"}; //Storage GPS info char gps_lat[20]={"\0"}; //Storage latitude char gps_alt[20]={"\0"}; //Storage altitude float flat, flon,falt; static uint8_t mydata[] = "Hello, world!"; //For test using. /* LoRaWAN NwkSKey, network session key This is the default Semtech key, which is used by the prototype TTN network initially. ttn*/ static const PROGMEM u1_t NWKSKEY[16] = { 0xE4, 0x2A, 0x93, 0x96, 0xF7, 0xC9, 0x65, 0x9E, 0xF8, 0x90, 0xC6, 0xA0, 0x1A, 0x88, 0xF7, 0x47 }; /* LoRaWAN AppSKey, application session key This is the default Semtech key, which is used by the prototype TTN network initially. ttn*/ static const u1_t PROGMEM APPSKEY[16] = { 0x75, 0x43, 0x26, 0xA1, 0x82, 0x79, 0x7F, 0xCF, 0x3C, 0x1D, 0xBF, 0xF9, 0xBF, 0xCB, 0xC6, 0xD9 }; /* LoRaWAN end-device address (DevAddr) See http://thethingsnetwork.org/wiki/AddressSpace ttn*/ static const u4_t DEVADDR = 0x260111D1; /* These callbacks are only used in over-the-air activation, so they are left empty here (we cannot leave them out completely unless DISABLE_JOIN is set in config.h, otherwise the linker will complain).*/ void os_getArtEui (u1_t* buf) { } void os_getDevEui (u1_t* buf) { } void os_getDevKey (u1_t* buf) { } static osjob_t initjob,sendjob,blinkjob; /* Schedule TX every this many seconds (might become longer due to duty cycle limitations).*/ const unsigned TX_INTERVAL = 20; // Pin mapping const lmic_pinmap lmic_pins = { .nss = 10, .rxtx = LMIC_UNUSED_PIN, .rst = 9, .dio = {2, 6, 7}, }; void do_send(osjob_t* j){ // Check if there is not a current TX/RX job running if (LMIC.opmode & OP_TXRXPEND) { Serial.println("OP_TXRXPEND, not sending"); } else { GPSRead(); GPSWrite(); // Prepare upstream data transmission at the next possible time. LMIC_setTxData2(1,datasend,sizeof(datasend)-1,0); //LMIC_setTxData2(1, mydata, sizeof(mydata)-1, 0); Serial.println("Packet queued"); Serial.print("LMIC.freq:"); Serial.println(LMIC.freq); Serial.println(""); Serial.println(""); Serial.println("Receive data:"); } // Next TX is scheduled after TX_COMPLETE event. } void onEvent (ev_t ev) { Serial.print(os_getTime()); Serial.print(": "); Serial.println(ev); switch(ev) { case EV_SCAN_TIMEOUT: Serial.println("EV_SCAN_TIMEOUT"); break; case EV_BEACON_FOUND: Serial.println("EV_BEACON_FOUND"); break; case EV_BEACON_MISSED: Serial.println("EV_BEACON_MISSED"); break; case EV_BEACON_TRACKED: Serial.println("EV_BEACON_TRACKED"); break; case EV_JOINING: Serial.println("EV_JOINING"); break; case EV_JOINED: Serial.println("EV_JOINED"); break; case EV_RFU1: Serial.println("EV_RFU1"); break; case EV_JOIN_FAILED: Serial.println("EV_JOIN_FAILED"); break; case EV_REJOIN_FAILED: Serial.println("EV_REJOIN_FAILED"); break; case EV_TXCOMPLETE: Serial.println("EV_TXCOMPLETE (includes waiting for RX windows)"); if(LMIC.dataLen) { // data received in rx slot after tx Serial.print("Data Received: "); Serial.write(LMIC.frame+LMIC.dataBeg, LMIC.dataLen); Serial.println(); } // Schedule next transmission os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send); break; case EV_LOST_TSYNC: Serial.println("EV_LOST_TSYNC"); break; case EV_RESET: Serial.println("EV_RESET"); break; case EV_RXCOMPLETE: // data received in ping slot Serial.println("EV_RXCOMPLETE"); break; case EV_LINK_DEAD: Serial.println("EV_LINK_DEAD"); break; case EV_LINK_ALIVE: Serial.println("EV_LINK_ALIVE"); break; default: Serial.println("Unknown event"); break; } } void setup() { // initialize digital pin as an output. Serial.begin(9600); ss.begin(9600); while(!Serial); Serial.println("LoRa GPS Example---- "); Serial.println("Connect to TTN"); #ifdef VCC_ENABLE // For Pinoccio Scout boards pinMode(VCC_ENABLE, OUTPUT); digitalWrite(VCC_ENABLE, HIGH); delay(1000); #endif // LMIC init os_init(); // Reset the MAC state. Session and pending data transfers will be discarded. LMIC_reset(); /*LMIC_setClockError(MAX_CLOCK_ERROR * 1/100); Set static session parameters. Instead of dynamically establishing a session by joining the network, precomputed session parameters are be provided.*/ #ifdef PROGMEM /* On AVR, these values are stored in flash and only copied to RAM once. Copy them to a temporary buffer here, LMIC_setSession will copy them into a buffer of its own again.*/ uint8_t appskey[sizeof(APPSKEY)]; uint8_t nwkskey[sizeof(NWKSKEY)]; memcpy_P(appskey, APPSKEY, sizeof(APPSKEY)); memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY)); LMIC_setSession (0x1, DEVADDR, nwkskey, appskey); #else // If not running an AVR with PROGMEM, just use the arrays directly LMIC_setSession (0x1, DEVADDR, NWKSKEY, APPSKEY); #endif // Disable link check validation LMIC_setLinkCheckMode(0); // TTN uses SF9 for its RX2 window. LMIC.dn2Dr = DR_SF9; // Set data rate and transmit power (note: txpow seems to be ignored by the library) LMIC_setDrTxpow(DR_SF7,14); // Start job do_send(&sendjob); } void GPSRead() { unsigned long age; gps.f_get_position(&flat, &flon, &age); falt=gps.f_altitude(); //get altitude flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6; flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6;//save six decimal places falt == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : falt, 2;//save two decimal places } void GPSWrite() { /*Convert GPS data to format*/ datastring1 +=dtostrf(flat, 0, 4, gps_lat); datastring2 +=dtostrf(flon, 0, 4, gps_lon); //datastring3 +=dtostrf(falt, 0, 2, gps_alt); if(flon!=1000.000000) { strcat(gps_lon,","); strcat(gps_lon,gps_lat); //strcat(gps_lon,","); //strcat(gps_lon,gps_alt); int i = 0; for(i = 0; i < 2; i++) { //datasend.toFloat(); atof(gps_lon); //Serial.println((char*)datasend); Serial.println("Testing converted data:"); Serial.println(gps_lon); // atof(gps_alt); // Serial.print(gps_alt); } strcpy(datasend,gps_lon); //the format of datasend is longtitude,latitude,altitude Serial.print("########### "); Serial.print("NO."); Serial.print(count); Serial.println(" ###########"); Serial.println("The longtitude and latitude are:"); Serial.print("["); Serial.print((char*)datasend); Serial.print("]"); Serial.print(""); /* for(int k = 0; k < 20;k++) { Serial.print("["); Serial.print(datasend[k], HEX); Serial.print("]"); } Serial.println(""); Serial.println("");*/ count++; } int32_t lng = flat * 10000; int32_t lat = flon * 10000; datasend[0] = lat; datasend[1] = lat >> 8; datasend[2] = lat >> 16; datasend[3] = lng; datasend[4] = lng >> 8; datasend[5] = lng >> 16; smartdelay(1000); } static void smartdelay(unsigned long ms) { unsigned long start = millis(); do { while (ss.available()) { gps.encode(ss.read()); } } while (millis() - start < ms); } void loop() { os_runloop_once(); } Lora/shield GPS to thingspeak issue What is your target time? You might consider using a mobile connection if one is available in you area. There is a smaller delay if you just posted directly to ThingSpeak. thingspeak thingsnetwork mqtt json
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