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[json] Bump heap fallback cap from 4096 to 5120

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Aligns with the doubling sequence from 640: 1280 -> 2560 -> 5120.
This commit is contained in:
J. Nick Koston
2026-02-18 18:10:29 -06:00
parent d967f47f3e
commit 2dd767ed3f
1 changed files with 3 additions and 3 deletions
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6
esphome/components/json/json_util.cpp
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@@ -122,8 +122,8 @@ SerializationBuffer<> JsonBuilder::serialize() {
// Payload exceeded stack buffer. Double the buffer and retry until it fits.
// In practice, one iteration (1024 bytes) covers all known entity types.
// Payloads exceeding 1024 bytes are not known to exist in real configurations.
// Cap at 4096 as a safety limit to prevent runaway allocation.
constexpr size_t max_heap_size = 4096;
// Cap at 5120 as a safety limit to prevent runaway allocation.
constexpr size_t max_heap_size = 5120;
size_t heap_size = buf_size * 2;
while (heap_size <= max_heap_size) {
result.reallocate_heap_(heap_size - 1);
@@ -134,7 +134,7 @@ SerializationBuffer<> JsonBuilder::serialize() {
}
heap_size *= 2;
}
// Payload exceeds 4096 bytes - return truncated result
// Payload exceeds 5120 bytes - return truncated result
ESP_LOGW(TAG, "JSON payload too large, truncated to %zu bytes", size);
result.set_size_(size);
return result;