I am trying to combine the httpclient and the GPS tracker.
However when I attempt to
request.hostname = "ServerIP";
request.port = 1234;
request.path = ("/?id=123456&lat="+(t.readLatDeg())
+"&lon="+(t.readLonDeg())
);
When I try to compile it I get:
/workspace//src/gps-tracker-alpha.cpp:96:67: error: invalid operands of types 'const char [17]' and 'float' to binary 'operator+'
if (transmittingData) {
I have a mix of static data to send in the request and then a couple variables. What is the correct way to do this?
Complete Code:
// This #include statement was automatically added by the Particle IDE.
#include <HttpClient.h>
#include <application.h>
#include "AssetTracker.h"
/* -----------------------------------------------------------
This example shows a lot of different features. As configured here
it will check for a good GPS fix every 10 minutes and publish that data
if there is one. If not, it will save you data by staying quiet. It also
registers 3 Particle.functions for changing whether it publishes,
reading the battery level, and manually requesting a GPS reading.
---------------------------------------------------------------*/
// httpclient paste start
unsigned int nextTime = 0; // Next time to contact the server
HttpClient http;
// Headers currently need to be set at init, useful for API keys etc.
http_header_t headers[] = {
// { "Content-Type", "application/json" },
// { "Accept" , "application/json" },
{ "Accept" , "*/*"},
{ NULL, NULL } // NOTE: Always terminate headers will NULL
};
http_request_t request;
http_response_t response;
// httpclient paste end
// Set whether you want the device to publish data to the internet by default here.
// 1 will Particle.publish AND Serial.print, 0 will just Serial.print
// Extremely useful for saving data while developing close enough to have a cable plugged in.
// You can also change this remotely using the Particle.function "tmode" defined in setup()
int transmittingData = 1;
// Used to keep track of the last time we published data
long lastPublish = 0;
// How many minutes between publishes? 10+ recommended for long-time continuous publishing!
int delayMinutes = 1;
// Creating an AssetTracker named 't' for us to reference
AssetTracker t = AssetTracker();
// A FuelGauge named 'fuel' for checking on the battery state
FuelGauge fuel;
// setup() and loop() are both required. setup() runs once when the device starts
// and is used for registering functions and variables and initializing things
void setup() {
// Sets up all the necessary AssetTracker bits
t.begin();
// Enable the GPS module. Defaults to off to save power.
// Takes 1.5s or so because of delays.
t.gpsOn();
// Opens up a Serial port so you can listen over USB
Serial.begin(9600);
// These three functions are useful for remote diagnostics. Read more below.
Particle.function("tmode", transmitMode);
Particle.function("batt", batteryStatus);
Particle.function("gps", gpsPublish);
}
// loop() runs continuously
void loop() {
// You'll need to run this every loop to capture the GPS output
t.updateGPS();
// if the current time - the last time we published is greater than your set delay...
if (millis()-lastPublish > delayMinutes*60*1000) {
// Remember when we published
lastPublish = millis();
//String pubAccel = String::format("%d,%d,%d", t.readX(), t.readY(), t.readZ());
//Serial.println(pubAccel);
//Particle.publish("A", pubAccel, 60, PRIVATE);
// Dumps the full NMEA sentence to serial in case you're curious
Serial.println(t.preNMEA());
// GPS requires a "fix" on the satellites to give good data,
// so we should only publish data if there's a fix
if (t.gpsFix()) {
if (transmittingData) {
// Short publish names save data!
Particle.publish("G", t.readLatLon(), 60, PRIVATE);
request.hostname = "ServerIP";
request.port = 1234;
request.path = ("/?id=123456&lat="+(t.readLatDeg())
+"&lon="+(t.readLonDeg())
);
// request.path = "/?id=123456&lat=(t.readLatDeg()&lon=(t.readLonDeg()&speed=(t.getSpeed()&altitude=(t.getAltitude()&batt=String(fuel.getSoC()";
// http.get(request, response, headers);
// Serial.print("Application>\tResponse status: ");
// Serial.println(response.status);
// Serial.print("Application>\tHTTP Response Body: ");
// Serial.println(response.body);
}
// but always report the data over serial for local development
Serial.println(t.readLatLon());
}
}
}
// Allows you to remotely change whether a device is publishing to the cloud
// or is only reporting data over Serial. Saves data when using only Serial!
// Change the default at the top of the code.
int transmitMode(String command) {
transmittingData = atoi(command);
return 1;
}
// Actively ask for a GPS reading if you're impatient. Only publishes if there's
// a GPS fix, otherwise returns '0'
int gpsPublish(String command) {
if (t.gpsFix()) {
Particle.publish("G", t.readLatLon(), 60, PRIVATE);
// uncomment next line if you want a manual publish to reset delay counter
// lastPublish = millis();
return 1;
} else {
return 0;
}
}
// Lets you remotely check the battery status by calling the function "batt"
// Triggers a publish with the info (so subscribe or watch the dashboard)
// and also returns a '1' if there's >10% battery left and a '0' if below
int batteryStatus(String command){
// Publish the battery voltage and percentage of battery remaining
// if you want to be really efficient, just report one of these
// the String::format("%f.2") part gives us a string to publish,
// but with only 2 decimal points to save space
Particle.publish("B",
"v:" + String::format("%.2f",fuel.getVCell()) +
",c:" + String::format("%.2f",fuel.getSoC()),
60, PRIVATE
);
// if there's more than 10% of the battery left, then return 1
if (fuel.getSoC()>10){ return 1;}
// if you're running out of battery, return 0
else { return 0;}
}
Thanks!