extend telemetry queue to five seconds

README.md

@@ -28,6 +28,8 @@ Both breakouts share SDA, SCL, 3V3, and GND. The firmware checks both possible
 - ADXL345: `0x53` or `0x1D`; expected `DEVID` is `0xE5`.
 - L3G4200D: `0x69` or `0x68`; expected `WHO_AM_I` is `0xD3`.
 
+The XIAO ESP32-C3 external antenna is installed for the upcoming BLE transport.
+
 ## Sensor configuration
 
 - ADXL345: nominal 100 Hz output rate, full-resolution mode, +/-8 g. Nominal scale is
@@ -63,7 +65,8 @@ consumer can distinguish a fresh sample from a repeated poll and identify gyro
 overruns. Hardware data-ready interrupts and FIFO acquisition are deferred to the
 later sensor-side acquisition refinement.
 
-Completed samples enter a 128-record RAM queue. A lower-priority output task
+Completed samples enter a 512-record RAM queue, providing 5.12 seconds of
+transport-stall tolerance at 100 Hz. A lower-priority output task
 batches up to eight records into versioned `TRK1` frames, isolating acquisition
 from brief USB or future BLE stalls. CRC, packet and sample sequences, timestamps,
 and cumulative loss/overrun counters make loss detectable.