thooge/esp32-nmea2000-obp60
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Add backoff in PageNavigation for better handling with bad connection

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This commit is contained in:
norbert-walter
2026-02-20 17:21:26 +01:00
parent c647c2fe44
commit 2de3a1b084
3 changed files with 34 additions and 13 deletions
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lib/obp60task/PageNavigation.cpp
+29 -4
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@@ -374,8 +374,21 @@ bool showValues = false; // Show values HDT, SOG, DBT in navigation map
getdisplay().setPartialWindow(0, 0, getdisplay().width(), getdisplay().height()); // Set partial update
getdisplay().setTextColor(commonData->fgcolor);
// NEW: simple exponential backoff for 1 Hz polling (prevents connection-refused storms)
static uint32_t nextAllowedMs = 0;
static uint8_t failCount = 0;
uint32_t now = millis();
// NEW: if we are in backoff window, skip network call and use backup immediately
bool allowFetch = ((int32_t)(now - nextAllowedMs) >= 0);
// If a network connection to URL then load the navigation map
if (net.fetchAndDecompressJson(url)) {
if (allowFetch && net.fetchAndDecompressJson(url)) {
// NEW: reset backoff on success
failCount = 0;
nextAllowedMs = now + 1000; // keep 1 Hz on success
auto& json = net.json(); // Extract JSON content
int numPix = json["number_pixels"] | 0; // Read number of pixels
@@ -397,7 +410,7 @@ bool showValues = false; // Show values HDT, SOG, DBT in navigation map
size_t imgSize = numPix; // Calculate image size
uint8_t* imageData = (uint8_t*) heap_caps_malloc(imgSize, MALLOC_CAP_SPIRAM); // Allocate PSRAM for image
if (!imageData) {
LOG_DEBUG(GwLog::ERROR,"Error PageNavigation: PPSRAM alloc image buffer failed");
LOG_DEBUG(GwLog::ERROR,"Error PageNavigation: PSRAM alloc image buffer failed");
free(b64);
return PAGE_UPDATE;
}
@@ -426,12 +439,25 @@ bool showValues = false; // Show values HDT, SOG, DBT in navigation map
}
// If no network connection then use backup navigation map
else{
// NEW: update backoff only if we actually attempted a fetch (not when skipping due to backoff)
if (allowFetch) {
// NEW: exponential backoff: 1s,2s,4s,8s,16s,30s (capped)
if (failCount < 6) failCount++;
uint32_t backoffMs = 1000u << failCount;
if (backoffMs > 30000u) backoffMs = 30000u;
nextAllowedMs = now + backoffMs;
} else {
// NEW: we are currently backing off; do not increase failCount further
// nextAllowedMs stays unchanged
}
// Show backup image (backup navigation map)
if (hasImageBackup) {
getdisplay().drawBitmap(0, 25, imageBackupData, imageBackupWidth, imageBackupHeight, commonData->fgcolor);
}
// Show info: Connection lost when 5 page refreshes has a connection lost to the map server
// Show connection lost info when 5 page refreshes has a connection lost to the map server
// Short connection losts are uncritical
if(lostCounter >= 5){
getdisplay().setFont(&Ubuntu_Bold12pt8b);
@@ -444,7 +470,6 @@ bool showValues = false; // Show values HDT, SOG, DBT in navigation map
lostCounter++; // Increment lost counter
}
// ############### Draw Values ################
getdisplay().setFont(&Ubuntu_Bold12pt8b);