PDN connectivity reject（Insufficient resources）

如果出现类似以下日志报错，主要还是跟网络有关
//snip some OTA log
[0xB0E2] OTA LOG 06:21:54.086 LTE NAS ESM Plain OTA Incoming MessagePDN connectivity reject Msg
06:21:54.086 [0xB0E2] LTE NAS ESM Plain OTA Incoming Message
pkt_version = 1 (0x1)
rel_number = 9 (0x9)
rel_version_major = 5 (0x5)
rel_version_minor = 0 (0x0)
eps_bearer_id_or_skip_id = 0 (0x0)
prot_disc = 2 (0x2) (EPS session management messages)
trans_id = 2 (0x2)
msg_type = 209 (0xd1) (PDN connectivity reject)
lte_esm_msg
pdn_connectivity_rej
esm_cause
esm_cause = 30 (0x1e) (Request rejected by Serving GW or PDN GW)
prot_config_incl = 0 (0x0)
back_off_timer_incl = 0 (0x0)
re_attemp_ind_incl = 0 (0x0)
nbifom_incl = 0 (0x0)
ext_prot_config_incl = 0 (0x0)

[0xB0E2] OTA LOG 06:22:08.084 LTE NAS ESM Plain OTA Incoming MessagePDN connectivity reject Msg
06:22:08.084 [0xB0E2] LTE NAS ESM Plain OTA Incoming Message
pkt_version = 1 (0x1)
rel_number = 9 (0x9)
rel_version_major = 5 (0x5)
rel_version_minor = 0 (0x0)
eps_bearer_id_or_skip_id = 0 (0x0)
prot_disc = 2 (0x2) (EPS session management messages)
trans_id = 3 (0x3)
msg_type = 209 (0xd1) (PDN connectivity reject)
lte_esm_msg
pdn_connectivity_rej
esm_cause
esm_cause = 26 (0x1a) (Insufficient resources)
prot_config_incl = 0 (0x0)
back_off_timer_incl = 0 (0x0)
re_attemp_ind_incl = 0 (0x0)
nbifom_incl = 0 (0x0)
ext_prot_config_incl = 0 (0x0)

Cause #30 – Request rejected by Serving GW or PDN GW
This ESM cause is used by the network to indicate that the requested service or operation or the request for a resource was rejected by the Serving GW or PDN GW

Cause #26 - Insufficient resources
This cause code is used by the MS or by the network to indicate that a PDP context activation request, secondary
PDP context activation request, PDP context modification request, or MBMS context activation request cannot
be accepted due to insufficient resources