Все LineStatus=3 держится стабильно, но как оказалось это не является залогом хорошой связи. Ниже ЛОГ. Если СИМки обе вставлены в USBмодем на разных компьютерах то друг друга в сети они пингует быстро. А при ПМ-01 пинг вообще редко проходит даже при LineStatus=3

22:13:32.265 [61904] КЛИЕНТ ЗАПУЩЕН
22:13:32.640 [61904] СЕРВЕР ЗАПУЩЕН
22:13:34.265 [65488] (192.168.21.138:502) Подключение - ОК
22:13:34.265 [65488] (192.168.21.138:502) Tx: [12] 00 01 00 00 00 06 05 03 00 00 00 01
22:13:36.281 [65488] (192.168.21.138:502) Rx: [11] 00 01 00 00 00 05 05 03 02 0D F4
22:14:00.000 [65488] (192.168.21.138:502) Tx: [12] 00 02 00 00 00 06 05 03 00 00 00 01
22:14:15.015 [65488] (192.168.21.138:502) Tx: [12] 00 03 00 00 00 06 05 03 00 00 00 01
22:14:27.062 [65488] (192.168.21.138:502) Rx: [11] 00 03 00 00 00 05 05 03 02 0E 1D
22:14:56.265 [65488] (192.168.21.138:502) Закрытие соединения удаленным хостом (Connection Closed Gracefully)
22:16:02.875 [65488] (192.168.21.138:502) Подключение - ОК
22:16:02.875 [65488] (192.168.21.138:502) Tx: [12] 00 04 00 00 00 06 05 03 00 00 00 01
22:16:17.875 [65488] (192.168.21.138:502) Tx: [12] 00 05 00 00 00 06 05 03 00 00 00 01
22:16:32.890 [65488] (192.168.21.138:502) Tx: [12] 00 06 00 00 00 06 05 03 00 00 00 01
22:16:47.906 [65488] (192.168.21.138:502) Tx: [12] 00 07 00 00 00 06 05 03 00 00 00 01
22:17:02.921 [65488] (192.168.21.138:502) Tx: [12] 00 08 00 00 00 06 05 03 00 00 00 01
22:17:17.921 [65488] (192.168.21.138:502) Tx: [12] 00 09 00 00 00 06 05 03 00 00 00 01
22:17:22.453 [65488] (192.168.21.138:502) Закрытие соединения удаленным хостом (Connection Closed Gracefully)
22:17:35.187 [65488] (192.168.21.138:502) Подключение - ОК
22:17:35.187 [65488] (192.168.21.138:502) Tx: [12] 00 0A 00 00 00 06 05 03 00 00 00 01
22:17:50.187 [65488] (192.168.21.138:502) Tx: [12] 00 0B 00 00 00 06 05 03 00 00 00 01
22:18:05.203 [65488] (192.168.21.138:502) Tx: [12] 00 0C 00 00 00 06 05 03 00 00 00 01
22:18:20.218 [65488] (192.168.21.138:502) Отключение - ОК
22:18:20.218 [65488] Ошибка: устройство не отвечает (192.168.21.138:502 Адрес:5)
22:18:23.593 [65488] (192.168.21.138:502) Подключение - ОК
22:18:23.593 [65488] (192.168.21.138:502) Tx: [12] 00 0D 00 00 00 06 05 03 00 00 00 01
22:18:25.718 [65488] (192.168.21.138:502) Rx: [11] 00 0D 00 00 00 05 05 03 02 0F 14
22:19:02.437 [65488] (192.168.21.138:502) Закрытие соединения удаленным хостом (Connection Closed Gracefully)
22:20:03.375 [65488] (192.168.21.138:502) Подключение - ОК
22:20:03.375 [65488] (192.168.21.138:502) Tx: [12] 00 0E 00 00 00 06 05 03 00 00 00 01
22:20:18.375 [65488] (192.168.21.138:502) Tx: [12] 00 0F 00 00 00 06 05 03 00 00 00 01
22:20:33.390 [65488] (192.168.21.138:502) Tx: [12] 00 10 00 00 00 06 05 03 00 00 00 01
22:20:48.406 [65488] (192.168.21.138:502) Tx: [12] 00 11 00 00 00 06 05 03 00 00 00 01
22:20:48.609 [65488] (192.168.21.138:502) Закрытие соединения удаленным хостом (Connection Closed Gracefully)
22:21:06.156 [65488] (192.168.21.138:502) Подключение - ОК
22:21:06.156 [65488] (192.168.21.138:502) Tx: [12] 00 12 00 00 00 06 05 03 00 00 00 01
22:21:21.156 [65488] (192.168.21.138:502) Tx: [12] 00 13 00 00 00 06 05 03 00 00 00 01
22:21:36.171 [65488] (192.168.21.138:502) Tx: [12] 00 14 00 00 00 06 05 03 00 00 00 01
22:21:51.187 [65488] (192.168.21.138:502) Tx: [12] 00 15 00 00 00 06 05 03 00 00 00 01
22:22:06.187 [65488] (192.168.21.138:502) Tx: [12] 00 16 00 00 00 06 05 03 00 00 00 01
22:22:21.203 [65488] (192.168.21.138:502) Отключение - ОК
22:22:21.203 [65488] Ошибка: устройство не отвечает (192.168.21.138:502 Адрес:5)
22:22:24.218 [65488] (192.168.21.138:502) Подключение - ОК
22:22:24.218 [65488] (192.168.21.138:502) Tx: [12] 00 17 00 00 00 06 05 03 00 00 00 01