Thanks @MicroController! This did the trick. :D

For reference, this is what it looks like now:


reg_and_data[0] = reg_addr;
std::memcpy(&(reg_and_data[1]), reg_data, length);

esp_err_t error = i2c_master_transmit(_instance->_device_handle,
reg_and_data,
length + 1,
-1);


As an old Java ...

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