MQTT Secure Websocket - FATAL Unknown CA

[admin]

tls_set can fail if any of the supplied files cannot be read.
Check that the script can access them before calling tls_set:

Code:

log(
  io.exists('/data/ftp/AmazonRootCA1.pem'),
  io.exists('/data/ftp/0a1b2c3d4e-certificate.pem.crt'),
  io.exists('/data/ftp/0a1b2c3d4e-private.pem.key')
)