We are using nrf9160 as an LTE-M modem with the serial_lte_modem app running on it. Another chip (ESP32) communicates with it using AT commands and after a few minutes of successful communication (~tens of AT#XHTTPCREQ commands) the nrf chip gets stuck and no longer responds to requests.
serial_lte_modem & sdk version: 1.4.0
modem fw version: 1.2.2
network: NB-IOT, Vodafone Czech Republic
nrf log:
00> [00:05:52.526,519] <inf> httpc: Partial data received (235 bytes) 00> [00:05:52.557,861] <inf> httpc: Partial data received (42 bytes) 00> [00:05:52.557,861] <inf> httpc: All the data received (277 bytes) 00> [00:05:52.622,161] <inf> at_host: RX_DISABLED 00> [00:05:52.635,223] <inf> httpc: send header: 20 bytes 00> [00:05:52.635,620] <inf> httpc: wait until payload is ready 00> [00:05:52.644,042] <inf> httpc: send 51 bytes payload 00> [00:05:52.644,195] <inf> at_host: RX_DISABLED 00> [00:05:52.644,226] <wrn> at_host: UART RX buf rsp: -13 00> [00:05:52.644,317] <err> at_cmd: Invalid command 00> [00:05:52.644,317] <err> at_host: AT command error: -22 00> [00:05:52.646,118] <inf> at_host: RX_DISABLED following two lines repeat aprox. 500 times: 00> [00:05:52.647,827] <err> at_cmd: Invalid command 00> [00:05:52.647,827] <err> at_host: AT command error: -22 00> [00:05:53.708,984] <inf> httpc: Partial data received (277 bytes) 00> [00:05:53.708,984] <inf> httpc: All the data received (277 bytes)
Sometimes the nrf chip reboots on its own, but most of the time it gets stuck and manual reboot is required.
The log contains `[00:04:22.522,003] <wrn> at_host: UART RX buf rsp: -13` but we have also captured logs without this error.
