I'm writing a sketch to use on an ESP32 WROOM 32D and am getting the error;
Sketch uses 1499609 bytes (114%) of program storage space. Maximum is 1310720 bytes. text section exceeds available space in board
Global variables use 56780 bytes (17%) of dynamic memory, leaving 270900 bytes for local variables. Maximum is 327680 bytes.
Sketch too big; see https://support.arduino.cc/hc/en-us/articles/360013825179 for tips on reducing it.
The sketch is to read the data over BLE from my fitness tracker and then publish it over MQTT. It doesn't seem that big so where have I gone wrong?
(I have tried a similar sketch I found online and that was the same. ESP32/ESP32_OLED_HRM at master · CuriousTimo/ESP32 · GitHub)
#include "BLEDevice.h"
//#include "BLEScan.h"
//#include <ESP8266WiFi.h>
#include <WiFi.h>
#include <PubSubClient.h>
#include <NewPing.h>
// The remote service we wish to connect to.
static BLEUUID serviceUUID("XXXXXXXXXXXXXXXXXXXXXXXX");
// The characteristic of the remote service we are interested in.
static BLEUUID charUUID(BLEUUID((uint16_t)0x2A37));
static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;
static BLERemoteCharacteristic* pRemoteCharacteristic;
static BLEAdvertisedDevice* myDevice;
// Update these with values suitable for your network.
const char* ssid = "XXXXX";
const char* password = "XXXXXXXXX";
const char* mqtt_server = "XXXXXXXXXX";
WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (20)
char msg[MSG_BUFFER_SIZE];
int value = 0;
String temp_str;
char temp[20];
int HRM;
void setup_wifi()
{
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length)
{
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++)
{
Serial.print((char)payload[i]);
}
Serial.println();
}
void reconnect()
{
// Loop until we're reconnected
while (!client.connected())
{
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "HRMnick";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str()))
{
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("HRM/nick", "Running");
// ... and resubscribe
client.subscribe("HRM/nick/in");
}
else
{
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
static void notifyCallback
(
BLERemoteCharacteristic* pBLERemoteCharacteristic,
uint8_t* pData,
size_t length,
bool isNotify)
{
if (length == 2)
{
HRM = pData[1];
Serial.print("Heart Rate ");
Serial.print(HRM, DEC);
Serial.println("bpm");
temp_str = String(HRM);
temp_str.toCharArray(temp, temp_str.length() + 1);
client.publish("HRM/nick/out", temp, false);
}
}
class MyClientCallback : public BLEClientCallbacks
{
void onConnect(BLEClient* pclient)
{
connected = true;
Serial.println("onConnect");
}
void onDisconnect(BLEClient* pclient)
{
connected = false;
Serial.println("onDisconnect");
}
};
bool connectToServer()
{
Serial.print("Forming a connection to ");
Serial.println(myDevice->getAddress().toString().c_str());
BLEClient* pClient = BLEDevice::createClient();
Serial.println(" - Created client");
pClient->setClientCallbacks(new MyClientCallback());
// Connect to the remove BLE Server.
pClient->connect(myDevice); // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
Serial.println(" - Connected to server");
pClient->setMTU(517); //set client to request maximum MTU from server (default is 23 otherwise)
// Obtain a reference to the service we are after in the remote BLE server.
BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
if (pRemoteService == nullptr)
{
Serial.print("Failed to find our service UUID: ");
Serial.println(serviceUUID.toString().c_str());
pClient->disconnect();
return false;
}
Serial.println(" - Found our service");
// Obtain a reference to the characteristic in the service of the remote BLE server.
pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
if (pRemoteCharacteristic == nullptr)
{
Serial.print("Failed to find our characteristic UUID: ");
Serial.println(charUUID.toString().c_str());
pClient->disconnect();
return false;
}
Serial.println(" - Found our characteristic");
// Read the value of the characteristic.
if (pRemoteCharacteristic->canRead())
{
std::string value = pRemoteCharacteristic->readValue();
Serial.print("The characteristic value was: ");
Serial.println(value.c_str());
}
if (pRemoteCharacteristic->canNotify())
pRemoteCharacteristic->registerForNotify(notifyCallback);
connected = true;
return true;
}
//Scan for BLE servers and find the first one that advertises the service we are looking for.
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks
{
//Called for each advertising BLE server.
void onResult(BLEAdvertisedDevice advertisedDevice)
{
Serial.print("BLE Advertised Device found: ");
Serial.println(advertisedDevice.toString().c_str());
// We have found a device, let us now see if it contains the service we are looking for.
if (advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(serviceUUID)) {
BLEDevice::getScan()->stop();
myDevice = new BLEAdvertisedDevice(advertisedDevice);
doConnect = true;
doScan = true;
} // Found our server
} // onResult
}; // MyAdvertisedDeviceCallbacks
void setup()
{
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
Serial.println("Starting Arduino BLE Client application...");
BLEDevice::init("");
// Retrieve a Scanner and set the callback we want to use to be informed when we
// have detected a new device. Specify that we want active scanning and start the
// scan to run for 5 seconds.
BLEScan* pBLEScan = BLEDevice::getScan();
pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
pBLEScan->setInterval(1349);
pBLEScan->setWindow(449);
pBLEScan->setActiveScan(true);
pBLEScan->start(5, false);
} // End of setup.
// This is the Arduino main loop function.
void loop()
{
if (!client.connected())
{
reconnect();
}
client.loop();
// If the flag "doConnect" is true then we have scanned for and found the desired
// BLE Server with which we wish to connect. Now we connect to it. Once we are
// connected we set the connected flag to be true.
if (doConnect == true)
{
if (connectToServer())
{
Serial.println("We are now connected to the BLE Server.");
}
else
{
Serial.println("We have failed to connect to the server; there is nothin more we will do.");
}
doConnect = false;
}
// If we are connected to a peer BLE Server, update the characteristic each time we are reached
// with the current time since boot.
if (connected)
{
String newValue = "Time since boot: " + String(millis() / 1000);
//Serial.println("Setting new characteristic value to \"" + newValue + "\"");
//Serial.println("\"" + newValue + "\"");
// Set the characteristic's value to be the array of bytes that is actually a string.
pRemoteCharacteristic->writeValue(newValue.c_str(), newValue.length());
}
else if (doScan)
{
BLEDevice::getScan()->start(0); // this is just example to start scan after disconnect, most likely there is better way to do it in arduino
}
delay(1000); // Delay a second between loops.
} // End of loop
