more precise using PIIODevice::reading_now flag, Warning! one should use it manually now

small enum fix for pip_cmg

libs/main/io_devices/pican.cpp

@@ -103,7 +103,9 @@ ssize_t PICAN::readDevice(void * read_to, ssize_t max_size) {
 	//piCout << "PICAN read";
 	can_frame frame;
 	ssize_t ret = 0;
+	reading_now = true;
 	ret = ::read(sock, &frame, sizeof(can_frame));
+	reading_now = false;
 	if (ret < 0) {/*piCoutObj << "Error while read CAN frame " << ret;*/ return -1;}
 	//piCoutObj << "receive CAN frame Id =" << frame.can_id;
 	memcpy(read_to, frame.data, piMini(frame.can_dlc, max_size));