Barcode printer maker Zebra Technologies Corp said it would buy Motorola Solutions Incs enterprise business, which makes rugged mobile computers, tablets and barcode scanners, for $3.45 billion in cash. The deal will allow Zebra, whose products help companies such as Amazon Inc track inventory and supply chains, to tap the opportunity presented by the profusion of devices, ranging from cars to smoke alarms, connected to the Internet. Motorola Solutions enterprise clients include Wal-Mart Stores Inc and TNT Express. But the business, which accounts for about a third of Motorola Solutions total revenue, has been struggling as companies delay orders and cut spending.