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Arduino Nano 33 IoT large transfer fix (MCU hang bug) #316

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Arduino Nano 33 IoT large transfer fix (MCU hang bug) #316

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6 changes: 5 additions & 1 deletion src/utility/ATT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1246,7 +1246,11 @@ void ATTClass::writeReqOrCmd(uint16_t connectionHandle, uint16_t mtu, uint8_t op
return;
}

uint16_t handle = *(uint16_t*)data;
/// uint16_t handle = *(uint16_t*)data; // This hangs Arduino Nano 33 IoT in cases when data is unaligned
/// mainly when dealing with large packets. Copy the handle byte by byte in endianness independent way.
uint16_t handle;
((uint8_t *)&handle)[0] = ((uint8_t*)data)[0];
((uint8_t *)&handle)[1] = ((uint8_t*)data)[1];

if ((uint16_t)(handle - 1) > GATT.attributeCount()) {
if (withResponse) {
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