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Notes and Constraints

Updated on 2024-10-29 GMT+08:00
CAUTION:

When you use SMN to send emails or messages, ensure that the content complies with local laws and regulations.

SMN pushes messages asynchronously, which does not ensure the timeliness of message delivery. If your service requires messages need to be delivered in a quasi-real-time manner, exercise caution whether to use SMN.

The email addresses and phone numbers used by SMN to send emails, SMS messages, or voice calls can be changed. Do not whitelist such email addresses or phone numbers. Otherwise, SMN messages may fail to be received if they are changed.

The source IP address used by SMN to send messages is not fixed and may be changed at any time. Do not configure a whitelist for source IP addresses, or you may fail to receive SMN messages.

For network security purposes, SMN does not send messages to Huawei Cloud private networks by default.

SMN imposes restrictions on some items. Do not exceed their limits when using SMN. Otherwise, program exceptions may occur.

Table 1 lists the restrictions on topics.

Table 1 Restrictions on topics

Item

Quota

Description

Topic name

1 to 255 characters

If you enter 256 or more characters, the topic cannot be created.

Display name

192 bytes

If you enter 193 or more bytes, the topic cannot be created.

Tag

20

If you add 21 or more tags to a topic, the topic cannot be created.

Tag key length

128 characters

If you enter 129 or more characters, the tag cannot be created.

Tag value length

256 characters

If you enter 257 or more characters, the tag cannot be created.

Text message title

512 bytes

None

Text message content

256 KB

If a message exceeds 1,000 characters, the message delivery will fail due to message length limit by carriers.

JSON message content

256 KB

None

Template message content

256 KB

None

Table 2 lists restrictions on subscriptions.

Table 2 Restrictions on subscriptions

Item

Quota

Description

Endpoint

10,000

None

Validity of a subscription confirmation link

48 hours

Confirm the subscription on your mobile phone, mailbox, or other endpoints in time.

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