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Cut up log lines into 20-byte BLE packets

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This commit is contained in:
Sybren A. Stüvel 2026-03-14 20:15:24 +01:00
parent 3386db1b80
commit d4fbc17d43
1 changed files with 12 additions and 2 deletions
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14
src/helpers/esp32/BLELogInterface.h
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@ -31,8 +31,18 @@ class BLELogInterface : public Print, BLEServerCallbacks {
void flushLine() {
if (_line_len > 0 && _connected) {
_tx_char->setValue((uint8_t*)_line_buf, _line_len);
_tx_char->notify();
// BLE notifications are capped at ATT_MTU-3 bytes; MTU negotiation is not
// guaranteed, so always chunk at 20 bytes (the safe minimum) to ensure the
// full line is delivered regardless of the negotiated MTU.
const int CHUNK = 20;
int offset = 0;
while (offset < _line_len) {
int n = _line_len - offset;
if (n > CHUNK) n = CHUNK;
_tx_char->setValue((uint8_t*)_line_buf + offset, n);
_tx_char->notify();
offset += n;
}
}
_line_len = 0;
}