Esp01 Datasheet Online

Adequately describes the PCB trace antenna gain (~2dBi) and recommends keeping a keep-out area (no copper or ground plane) under the antenna on the host PCB.

⭐⭐⭐☆☆ (3/5)

The datasheet mentions GPIO0 and GPIO2 but does provide the definitive boot mode table: esp01 datasheet

The table is solid and critical for survival: Adequately describes the PCB trace antenna gain (~2dBi)