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Update send_ttl mainly for server models. When a server model receives a message, and the status is required to be replied by the application, we need to set send_ttl to the msg context. If send_ttl is not updated in btc, and the applcation does not set the TTL either, then the status will be replied with TTL=0, which may cause the client side (e.g. the phone App) failed to receive the status. Closes https://github.com/espressif/esp-idf/issues/5300