Function sendMessage

sendMessage(opts: SmppConnectOptions & SubmitOptions): Promise<string>
Sends a single message in one call: bind, submit, unbind.

A convenience wrapper over connect + SmppSession.submit for the fire-once case; it binds as a transmitter by default (override with bindMode). The session is always closed, even if the submission throws.
Parameters
- opts: SmppConnectOptions & SubmitOptions
  Connection/bind options merged with the submission fields.
Returns Promise<string>
The SMSC-assigned message_id.
Throws
If the SMSC rejects the credentials.

Throws
If the connection cannot be established.

Throws
If the SMSC rejects the submission.

Since
1.0.3
Example
```
import { sendMessage } from 'edgeport/smpp';

const id = await sendMessage({
	hostname: 'smsc.example.com',
	systemId: 'esme',
	password: env.SMPP_PW,
	source: 'EDGEPORT',
	destination: '12065550111',
	message: 'one-shot SMS from the edge'
});
```
- Defined in src/smpp/index.ts:840