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By Leohein
#15572 I had the same problem. I also thought the module was defect, so tried it with the AT firmware. ( used version v0.9.5.2 AT Firmware) . ---> The module was working fine.
Then I retried my arduino ide program, and .... the problem is solved :D

( I had the nodemcu firmware before, maybe that has something to do with the problem )