bs version3 (master) now supports concurrent secure and "public"
endpoints. Previously the server had to be started with either secure or
public endpoints. The default public endpoint ports remain 9091/2/3/4
and the default secure endpoint ports are 9081/2/3/4. Secure endpoints
are enabled by setting server.server_private_key. Public endpoints can
be disabled by setting server.secure_only. It remains possible to
disable individual endpoints (e.g. server.query_endpoints_enabled =
false). But these settings now affect both the secure and public ports.
Existing sever.client_address restrictions apply to all enabled
endpoints (secure and public). Finally, there are independent
configuration settings for each of the 8 possible endpoints (e.g.
secure_query_endpoint = tcp://*:9081). There are no necessary changes to
bx as the existing server.url configuration setting is sufficient.

Sample server config (all defaults except last 3):


[server]

# The heartbeat interval, defaults to 5.
heartbeat_interval_seconds = 5
# The subscription expiration time, defaults to 10.
subscription_expiration_minutes = 10
# The maximum number of subscriptions, defaults to 100000000.
subscription_limit = 100000000
# Write service requests to the log, defaults to false.
log_requests = true
# Disable public endpoints, defaults to false.
secure_only = false

# Enable the query endpoints, defaults to true.
query_endpoints_enabled = true
# Enable the heartbeat endpoints, defaults to true.
heartbeat_endpoints_enabled = true
# Enable the block publishing endpoints, defaults to true.
block_endpoints_enabled = true
# Enable the transaction publishing endpoints, defaults to true.
transaction_endpoints_enabled = true

# The public query endpoint, defaults to 'tcp://*:9091'.
public_query_endpoint = tcp://*:9091
# The public heartbeat endpoint, defaults to 'tcp://*:9092'.
public_heartbeat_endpoint = tcp://*:9092
# The public block publishing endpoint, defaults to 'tcp://*:9093'.
public_block_endpoint = tcp://*:9093
# The public transaction publishing endpoint, defaults to tcp://*:9094'.
public_transaction_endpoint = tcp://*:9094

# The secure query endpoint, defaults to 'tcp://*:9081'.
secure_query_endpoint = tcp://*:9081
# The secure heartbeat endpoint, defaults to 'tcp://*:9082'.
secure_heartbeat_endpoint = tcp://*:9082
# The secure block publishing endpoint, defaults to 'tcp://*:9083'.
secure_block_endpoint = tcp://*:9083
# The secure transaction publishing endpoint, defaults to tcp://*:9084'.
secure_transaction_endpoint = tcp://*:9084

# The Z85-encoded private key of the server, enables secure endpoints.
server_private_key = JTKVSB%%)wK0E.X)V>+}o?pNmC{O&4W4b!Ni{Lh6
# Allowed Z85-encoded public key of the client, multiple entries allowed.
client_public_key = )^^(VJ98$c[i?z%>R0=0?}>M/L)Tu/{g@yyFrcED
# Allowed client IP address, multiple entries allowed.
client_address = 127.0.0.1