Hello,
I am using the Nordic SDK v1.5.0, the modem firmware is mfw_nrf9160_1.2.3 and the DK for the nRF9160
In our application, we are using AT commands to setup and control the modem. On startup, the modem PSM and eDRX
features are switched off to prevent a disconnection due to power saving features. Then we open a TCP listening socket and
wait, on a separate thread, for remote clients to connect. This thread also reads data from connected clients, and uses poll() to
block and wait for events, as follows:
struct pollfd pollSet[SOCKET_ID_MAX];
pollSet[SOCKET_ID_CLIENT].fd = Sockets[SOCKET_ID_CLIENT];
pollSet[SOCKET_ID_CLIENT].events = POLLIN;
pollSet[SOCKET_ID_SERVER].fd = Sockets[SOCKET_ID_SERVER];
pollSet[SOCKET_ID_SERVER].events = POLLIN;
// should block forever, until a client connects or a
// connected client has sent data
if (0 < poll(pollSet,SOCKET_ID_MAX,-1))
{
// sockets handling code
}
Initially only the listening socket is open. However the poll() call never blocks, instead it returns immediately
with the server socket revents field set to zero ( = no events). I cannot understand why, it should block for
an wait incomming client connection.
For reference, these are the configuration I am using:
# Zephyr OS Network CONFIG_NETWORKING=y CONFIG_NET_NATIVE=n CONFIG_NET_SOCKETS=y CONFIG_NET_SOCKETS_OFFLOAD=y # Nordic Libraries CONFIG_NRF_MODEM_LIB=y CONFIG_LTE_LINK_CONTROL=n CONFIG_LTE_AUTO_INIT_AND_CONNECT=n
