I updated my fork with the main repo and now pushover not working. I send a test message, and get the following in logs:
I (548904) webserver: HTTP GET /cfg/notification

I (553254) webserver: HTTP POST /cfg/notification

I (553284) pushover: Sending message teszt with priority 0

E (570654) mongoose: mg_ssl_mbed_log      0x3fa44e14 mbedtls_ssl_fetch_input() returned -1 (-0x0001)

E (570654) mongoose: mg_ssl_mbed_log      0x3fa44e14 ssl_get_next_record() returned -1 (-0x0001)

E (570654) mongoose: mg_ssl_mbed_log      0x3fa44e14 mbedtls_ssl_read_record() returned -1 (-0x0001)

E (570654) mongoose: mg_ssl_if_mbed_err   0x3fa44e14 SSL error: -1

I (570654) pushover: PushoverMongooseCallback(MG_EV_CONNECT=-3:)

E (570654) pushover: Connection failed

I (570664) ovms-server-v2: Send MP-0 PIConnection failed