Submits an SMS for immediate delivery to one or more destination numbers
using Reseller-tier credentials.

Authentication: Query-parameter based — username + password in
the query string. No additional headers or tokens required.

Example Request (from your listed URL):

GET https://rslr.connectbind.com:8443/bulksms/bulksms
  ?username=xxxxxx
  &password=*******
  &type=0
  &dlr=1
  &destination=xxxx
  &source=xxx
  &message=Testing

Success Response Format (plain text):

1701|<CELL_NO>|<MESSAGE_ID>

The MESSAGE_ID can later be used to map delivery reports back to this submission.

Multi-Destination Reply Format:

<Error_Code>|<destination>|<message_id>,<Error_Code>|<destination>|<message_id>,...

Exceptional Situations:

• If a request has multiple destinations and an error other than "Invalid
  Destination" occurs, the whole batch is aborted immediately.
• If "Invalid Destination" occurs for one number in a batch, that number is
  skipped and the rest of the batch proceeds.
• If the SMPP server goes down mid-request, the API retries a fixed number
  of times (10ms gap between retries). If retries exhaust, the batch aborts
  at that destination and returns 1709|<destination_at_which_batch_aborted>
  appended to the partial results.
• If credits run out mid-batch, the batch aborts at that destination and
  returns 1025|<destination_at_which_batch_aborted> appended to the
  partial results.

Retry Guidance:

Apart from error 1709, do not retry re-sending the message for any
other error code (including standard SMPP v3.4 error codes, which may
also be returned where applicable).