Global Serial To Cellular Gateway Market By Product Type (2G, 3G, 4G or LTE, 5G), By Communication Protocol (RS232, RS485, RS422, Others), By Distribution Channel (Direct Sales, Distributors, Online), By Application (Industrial Automation, Transportation, Energy and Utilities, Retail, Healthcare, Other Applications), By Regional Analysis, Global Trends and Opportunity, Future Outlook By 2026-2035