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This commit is contained in:
J. Nick Koston
2026-01-04 12:46:35 -10:00
parent 9297850afe
commit 1ef6c6a416
2 changed files with 5 additions and 4 deletions
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5
esphome/components/api/api_connection.h
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@@ -28,10 +28,7 @@ static constexpr uint32_t KEEPALIVE_TIMEOUT_MS = 60000;
// TODO: Remove MAX_INITIAL_PER_BATCH_LEGACY before 2026.7.0 - all clients should support API 1.14 by then
static constexpr size_t MAX_INITIAL_PER_BATCH_LEGACY = 24; // For clients < API 1.14 (includes object_id)
static constexpr size_t MAX_INITIAL_PER_BATCH = 34; // For clients >= API 1.14 (no object_id)
// Maximum number of messages to process in a single batch
// This limit exists to prevent stack overflow from the MessageInfo/iovec arrays in process_batch_
// Each MessageInfo is 6 bytes, each iovec is 8 bytes: 34 * (6 + 8) = 476 bytes
static constexpr size_t MAX_MESSAGES_PER_BATCH = 34;
// Verify MAX_MESSAGES_PER_BATCH (defined in api_frame_helper.h) can hold the initial batch
static_assert(MAX_MESSAGES_PER_BATCH >= MAX_INITIAL_PER_BATCH,
"MAX_MESSAGES_PER_BATCH must be >= MAX_INITIAL_PER_BATCH");

4
esphome/components/api/api_frame_helper.h
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@@ -29,6 +29,10 @@ static constexpr uint16_t MAX_MESSAGE_SIZE = 8192; // 8 KiB for ESP8266
static constexpr uint16_t MAX_MESSAGE_SIZE = 32768; // 32 KiB for ESP32 and other platforms
#endif
// Maximum number of messages to batch in a single write operation
// Must be >= MAX_INITIAL_PER_BATCH in api_connection.h (enforced by static_assert there)
static constexpr size_t MAX_MESSAGES_PER_BATCH = 34;
// Forward declaration
struct ClientInfo;