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Consider the excellent ESP-Link firmware for ESP8266 to create a WiFi - RS232 serial gateway. Easy to interface to our NodeMCU boards available here Perfboard and headers NOT Included - Includes NodeMCU + Max232 Module Only .
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.