mbedTLS error: -0x7780

[fbalestrini]

Starting from few weeks ago, all my Mongoose OS based IoT devices fail connecting to the local Mosquitto MQTT broker. Everything worked fine since a couple of weeks ago.

This is my WEMOS D1 Mini board yml configuration:

config_schema: 
  - ["mqtt.enable", true]
  - ["mqtt.user", "<my_username>"]
  - ["mqtt.pass", "<my_password>"]
  - ["mqtt.server", "<my_loacal_IP_address>:8883"]
  - ["mqtt.ssl_ca_cert", "ca.pem"]

This is the error log of my WEMOS D1 Mini board:

[Sep 15 08:54:05.996] mgos_mqtt_conn.c:471    MQTT0 connecting to 192.168.1.254:8883
[Sep 15 08:54:06.020] mongoose.c:4912         0x3fff1574 is a fatal alert message (msg 40)
[Sep 15 08:54:06.025] mongoose.c:4912         0x3fff1574 mbedtls_ssl_handle_message_type() returned -30592 (-0x7780)
[Sep 15 08:54:06.034] mongoose.c:4912         0x3fff1574 mbedtls_ssl_read_record() returned -30592 (-0x7780)
[Sep 15 08:54:06.040] mongoose.c:5088         0x3fff1574 mbedTLS error: -0x7780
[Sep 15 08:54:06.050] mgos_mqtt_conn.c:229    MQTT0 TCP connect error (-3)
[Sep 15 08:54:06.050] mgos_mqtt_conn.c:256    MQTT0 Disconnect

This is the error log of my local Mosquitto MQTT broker:

1631689879: New connection from 192.168.1.15 on port 8883.
1631689879: OpenSSL Error[0]: error:1417A0C1:SSL routines:tls_post_process_client_hello:no shared cipher
1631689879: Socket error on client <unknown>, disconnecting.