feat: Setup core utilities for power management and robust data fetching

m5paper-stockticker.ino

@@ -4,6 +4,9 @@
 #include <HTTPClient.h>
 #include <ArduinoJson.h>
 #include <time.h>
+#include <esp_sleep.h>
+#include <esp_bt.h>
+#include <esp_wifi.h>
 #include "images.h"
 #include "config.h"
 
@@ -45,73 +48,154 @@ const int NUM_STOCKS = sizeof(myPortfolio) / sizeof(myPortfolio[0]);
 // -------------------------------------------------------
 struct StockData { float price, change, pct; bool valid; };
 
+void prepareForSleepAndEnter(uint64_t sleepUs) {
+  // Disable all wake sources first, then allow only timer wake.
+  esp_sleep_disable_wakeup_source(ESP_SLEEP_WAKEUP_ALL);
+  esp_sleep_enable_timer_wakeup(sleepUs);
+
+  // Shut down radios and protocol stacks.
+  WiFi.disconnect(true, true);
+  WiFi.mode(WIFI_OFF);
+  esp_wifi_stop();
+  esp_wifi_deinit();
+
+  btStop();
+  esp_bt_controller_disable();
+  esp_bt_controller_deinit();
+
+  // Power down optional domains where this core/target exposes them.
+#ifdef ESP_PD_DOMAIN_RTC_PERIPH
+  esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_OFF);
+#endif
+#ifdef ESP_PD_DOMAIN_RTC_FAST_MEM
+  esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_FAST_MEM, ESP_PD_OPTION_OFF);
+#endif
+#ifdef ESP_PD_DOMAIN_RTC_SLOW_MEM
+  esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_SLOW_MEM, ESP_PD_OPTION_OFF);
+#endif
+#ifdef ESP_PD_DOMAIN_XTAL
+  esp_sleep_pd_config(ESP_PD_DOMAIN_XTAL, ESP_PD_OPTION_OFF);
+#endif
+
+  esp_deep_sleep_start();
+}
+
 bool fetchStock(const char* sym, StockData& out) {
   out = { 0.0f, 0.0f, 0.0f, false };
-  if (WiFi.status() != WL_CONNECTED) return false;
+  if (WiFi.status() != WL_CONNECTED) { Serial.println("[FH] no WiFi"); return false; }
 
   char url[220];
   snprintf(url, sizeof(url),
     "https://finnhub.io/api/v1/quote?symbol=%s&token=%s", sym, apiKey);
 
-  WiFiClientSecure client;
+  for (int attempt = 1; attempt <= 3; attempt++) {
-  client.setInsecure();
+    WiFiClientSecure client;
-  HTTPClient http;
+    client.setInsecure();
-  http.begin(client, url);
+    HTTPClient http;
-  int code = http.GET();
+    http.setConnectTimeout(8000);
-  if (code != HTTP_CODE_OK) { http.end(); return false; }
+    http.setTimeout(8000);
+    if (!http.begin(client, url)) {
+      Serial.printf("[FH] %s begin() failed (try %d)\n", sym, attempt);
+      http.end();
+      delay(300);
+      continue;
+    }
+    int code = http.GET();
+    if (code != HTTP_CODE_OK) {
+      Serial.printf("[FH] %s HTTP %d (try %d)\n", sym, code, attempt);
+      http.end();
+      delay(400);
+      continue;
+    }
 
-  String body = http.getString();
+    String body = http.getString();
-  http.end();
+    http.end();
 
-  StaticJsonDocument<512> doc;
+    StaticJsonDocument<512> doc;
-  if (deserializeJson(doc, body)) return false;
+    DeserializationError err = deserializeJson(doc, body);
+    if (err) {
+      Serial.printf("[FH] %s JSON err: %s\n", sym, err.c_str());
+      delay(300);
+      continue;
+    }
 
-  out.price  = doc["c"] | 0.0f;
+    out.price  = doc["c"] | 0.0f;
-  out.change = doc["d"] | 0.0f;
+    out.change = doc["d"] | 0.0f;
-  out.pct    = doc["dp"] | 0.0f;
+    out.pct    = doc["dp"] | 0.0f;
-  out.valid  = (out.price > 0.0f);
+    out.valid  = (out.price > 0.0f);
-  return out.valid;
+    if (out.valid) return true;
+    Serial.printf("[FH] %s price 0 (body: %s)\n", sym, body.c_str());
+    delay(300);
+  }
+  return false;
 }
 
 // Alpha Vantage fetch (for mutual funds not covered by Finnhub)
 bool fetchStockAV(const char* sym, StockData& out) {
   out = { 0.0f, 0.0f, 0.0f, false };
-  if (WiFi.status() != WL_CONNECTED) return false;
+  if (WiFi.status() != WL_CONNECTED) { Serial.println("[AV] no WiFi"); return false; }
 
   char url[256];
   snprintf(url, sizeof(url),
     "https://www.alphavantage.co/query?function=GLOBAL_QUOTE&symbol=%s&apikey=%s",
     sym, avApiKey);
 
-  WiFiClientSecure client;
+  for (int attempt = 1; attempt <= 3; attempt++) {
-  client.setInsecure();
+    WiFiClientSecure client;
-  HTTPClient http;
+    client.setInsecure();
-  http.begin(client, url);
+    HTTPClient http;
-  int code = http.GET();
+    http.setConnectTimeout(8000);
-  if (code != HTTP_CODE_OK) { http.end(); return false; }
+    http.setTimeout(8000);
+    if (!http.begin(client, url)) {
+      Serial.printf("[AV] %s begin() failed (try %d)\n", sym, attempt);
+      http.end();
+      delay(300);
+      continue;
+    }
+    int code = http.GET();
+    if (code != HTTP_CODE_OK) {
+      Serial.printf("[AV] %s HTTP %d (try %d)\n", sym, code, attempt);
+      http.end();
+      delay(400);
+      continue;
+    }
 
-  String body = http.getString();
+    String body = http.getString();
-  http.end();
+    http.end();
 
-  StaticJsonDocument<1024> doc;
+    StaticJsonDocument<1024> doc;
-  if (deserializeJson(doc, body)) return false;
+    DeserializationError err = deserializeJson(doc, body);
+    if (err) {
+      Serial.printf("[AV] %s JSON err: %s\n", sym, err.c_str());
+      delay(300);
+      continue;
+    }
 
-  JsonObject q = doc["Global Quote"];
+    JsonObject q = doc["Global Quote"];
-  if (q.isNull()) return false;
+    if (q.isNull()) {
+      // Free tier limit / rate note comes back without "Global Quote".
+      Serial.printf("[AV] %s no quote (body: %s)\n", sym, body.c_str());
+      delay(300);
+      continue;
+    }
 
-  out.price  = atof(q["05. price"]  | "0");
+    out.price  = atof(q["05. price"]  | "0");
-  out.change = atof(q["09. change"] | "0");
+    out.change = atof(q["09. change"] | "0");
 
-  // "10. change percent" is like "0.0500%" - strip the trailing '%'
+    // "10. change percent" is like "0.0500%" - strip the trailing '%'
-  char pctBuf[16];
+    char pctBuf[16];
-  strncpy(pctBuf, q["10. change percent"] | "0%", sizeof(pctBuf) - 1);
+    strncpy(pctBuf, q["10. change percent"] | "0%", sizeof(pctBuf) - 1);
-  pctBuf[sizeof(pctBuf) - 1] = '\0';
+    pctBuf[sizeof(pctBuf) - 1] = '\0';
-  char* pctMark = strchr(pctBuf, '%');
+    char* pctMark = strchr(pctBuf, '%');
-  if (pctMark) *pctMark = '\0';
+    if (pctMark) *pctMark = '\0';
-  out.pct   = atof(pctBuf);
+    out.pct   = atof(pctBuf);
 
-  out.valid = (out.price > 0.0f);
+    out.valid = (out.price > 0.0f);
-  return out.valid;
+    if (out.valid) return true;
+    Serial.printf("[AV] %s price 0\n", sym);
+    delay(300);
+  }
+  return false;
 }
 
 // -------------------------------------------------------
@@ -154,12 +238,14 @@ void setup() {
   auto cfg = M5.config();
   M5.begin(cfg);
   M5.Display.setRotation(1);
+  Serial.begin(115200);
 
   // Connect to WiFi
   WiFi.begin(ssid, password);
   for (int i = 0; i < 40 && WiFi.status() != WL_CONNECTED; i++) delay(500);
 
   if (WiFi.status() != WL_CONNECTED) {
+    int batPct = M5.Power.getBatteryLevel();
     M5.Display.fillScreen(TFT_WHITE);
     M5.Display.setFont(&fonts::AsciiFont8x16);
     M5.Display.setTextColor(TFT_BLACK, TFT_WHITE);