@pubnub/mcp

# Configuration API – PubNub C# SDK This condensed version keeps every code block, method signature, parameter, and other critical technical details from the full documentation. --- ## Request execution We recommend wrapping SDK calls in `try / catch`. ```csharp try { PNResult<PNPublishResult> publishResponse = await pubnub.Publish() .Message("Why do Java developers wear glasses? Because they can't C#.") .Channel("my_channel") .ExecuteAsync(); PNStatus status = publishResponse.Status; Console.WriteLine("Server status code : " + status.StatusCode.ToString()); } catch (Exception ex) { Console.WriteLine($"Request can't be executed due to error: {ex.Message}"); } ``` --- ## PNConfiguration Holds all runtime options that affect PubNub client behavior. ### Creation ``` ` ` ``` ### Properties * **SubscribeKey** *(string, required)* – Admin Portal value. * **PublishKey** *(string)* – required for publishing. * **SecretKey** *(string)* – required for PAM. * **UserId** *(UserId, required)* – unique UTF-8 id (≤92 chars). * **LogLevel** *(PubnubLogLevel)* – Trace | Debug | Info | Warn | Error | None (default). * **AuthKey** *(string)* – PAM auth token. * **Secure** *(bool)* – enable TLS. * **SubscribeTimeout** *(int sec)* – subscribe loop timeout. * **NonSubscribeRequestTimeout** *(int sec)* – all other requests timeout. * **FilterExpression** *(string)* – server-side stream filter. * **HeartbeatNotificationOption** *(PNHeartbeatNotificationOption)* – ALL | FAILURES | NONE. * **Origin** *(string)* – custom domain. * **ReconnectionPolicy** *(PNReconnectionPolicy)* – NONE | LINEAR | EXPONENTIAL (default). * **ConnectionMaxRetries** *(int)* – maximum reconnect attempts. * **PresenceTimeout** *(int sec)* – server presence TTL. * **SetPresenceTimeoutWithCustomInterval** *(int sec)* – heartbeat interval. * **Proxy** *(Proxy)* – HTTP proxy settings. * **RequestMessageCountThreshold** *(int)* – raises `PNRequestMessageCountExceededCategory`. * **SuppressLeaveEvents** *(bool)* – omit leave events. * **DedupOnSubscribe** *(bool)* – de-duplicate subscribe payloads. * **MaximumMessagesCacheSize** *(int)* – size for de-duplication cache (default 100). * **FileMessagePublishRetryLimit** *(int)* – publish-file retry attempts (default 5). * **CryptoModule** – see CryptoModule section. * **EnableEventEngine** *(bool, default true)* – use new subscribe/presence engine. * **MaintainPresenceState** *(bool)* – resend custom presence state (Event Engine only). * **RetryConfiguration** – `RetryConfiguration.Linear(...)` or `RetryConfiguration.Exponential(...)`. * **Deprecated**: `LogVerbosity`, `PubnubLog`, `CipherKey`, `UseRandomInitializationVector`, `Uuid`. --- ### CryptoModule Two built-in options: * `LegacyCryptor(CipherKey)` – 128-bit legacy. * `AesCbcCryptor(CipherKey)` – 256-bit AES-CBC (recommended). If **CryptoModule** isn’t explicitly set but `CipherKey`/`UseRandomInitializationVector` are, legacy encryption is used. Configuration methods: ``` ` ` ``` Older SDK (< 6.18.0) cannot decrypt AES-CBC traffic. --- ## Initialization ### Include ``` ` ` ``` ### Method ``` ` ` ``` *Parameter*: **pnConfiguration** – see PNConfiguration above. Returns: `PubNub` client instance (used for `Publish()`, `Subscribe()`, etc.). ### Examples (Place-holder blocks preserved) ``` ` ` ``` ``` ` ` ``` ``` ` ` ``` ``` ` ` ``` ``` ` ` ``` --- ## UserId Setter/getter: ``` ` ` ``` ``` `pubnub.GetCurrentUserId(); ` ``` Examples: ``` ` ` ``` ``` ` ` ``` --- ## Authentication key Property: ``` `pnConfiguration.AuthKey ` ``` Examples: ``` ` ` ``` ``` ` ` ``` Returns current AuthKey. --- ## Filter expression Property: ``` `FilterExpression ` ``` ``` `pnConfiguration.FilterExpression; ` ``` Examples: ``` ` ` ``` ``` `**` ```