No SMS to send

When there is no SMS to send then every minute the script creates a line with the text:

user.notice poll_api: Received code 99 - no SMS to send

There are some other events registered in the log as well so the log looks similar to the example below:

Wed Aug 20 06:41:13 2025 user.notice poll_api: Received code 99 - no SMS to send
Wed Aug 20 06:42:14 2025 user.notice poll_api: Received code 99 - no SMS to send
Wed Aug 20 06:43:14 2025 user.notice poll_api: Received code 99 - no SMS to send
Wed Aug 20 06:43:54 2025 local1.info gsmd[2776]: gsmd send: 'AT^SYSINFOEX' (13)
Wed Aug 20 06:43:54 2025 local1.info gsmd[2776]: gsmd get: '^SYSINFOEX: 2,3,0,1,,6,"LTE",101,"LTE"' (38)
Wed Aug 20 06:43:54 2025 local1.info gsmd[2776]: gsmd send: 'AT+CREG?' (9)
Wed Aug 20 06:43:54 2025 local1.info gsmd[2776]: gsmd get: '+CREG: 2,1,"FFFE","2351D02",7' (29)
Wed Aug 20 06:43:57 2025 local1.info gsmd[2776]: gsmd send: 'AT^SYSINFOEX' (13)
Wed Aug 20 06:43:57 2025 local1.info gsmd[2776]: gsmd get: '^SYSINFOEX: 2,3,0,1,,6,"LTE",101,"LTE"' (38)
Wed Aug 20 06:43:57 2025 local1.info gsmd[2776]: gsmd send: 'AT+CREG?' (9)
Wed Aug 20 06:43:57 2025 local1.info gsmd[2776]: gsmd get: '+CREG: 2,1,"FFFE","2351D02",7' (29)
Wed Aug 20 06:44:15 2025 user.notice poll_api: Received code 99 - no SMS to send
Wed Aug 20 06:45:09 2025 local1.info gsmd[2776]: gsmd send: 'AT+COPS?' (9)
Wed Aug 20 06:45:09 2025 local1.info gsmd[2776]: gsmd get: '+COPS: 0,2,"26001",7' (20)
Wed Aug 20 06:45:09 2025 user.info Messaged[10274]: Start from new event "Network Operator" "Connected to Plus operator"
Wed Aug 20 06:45:12 2025 local1.info gsmd[2776]: gsmd send: 'AT^SYSINFOEX' (13)
Wed Aug 20 06:45:12 2025 local1.info gsmd[2776]: gsmd get: '^SYSINFOEX: 2,3,0,1,,6,"LTE",101,"LTE"' (38)
Wed Aug 20 06:45:12 2025 local1.info gsmd[2776]: gsmd send: 'AT+CREG?' (9)
Wed Aug 20 06:45:12 2025 local1.info gsmd[2776]: gsmd get: '+CREG: 2,1,"FFFE","2351D16",7' (29)
Wed Aug 20 06:45:16 2025 user.notice poll_api: Received code 99 - no SMS to send
Wed Aug 20 06:46:16 2025 user.notice poll_api: Received code 99 - no SMS to send