=== device 表结构 ===
id | int(10) unsigned | NO
company_id | int(10) unsigned | NO
unit_id | int(10) unsigned | NO
sn | varchar(100) | NO
device_code | varchar(64) | NO
name | varchar(100) | NO
type | varchar(30) | NO
model_id | int(10) unsigned | NO
protocol | varchar(20) | YES
ip | varchar(45) | YES
port | int(10) unsigned | YES
stream_url | varchar(500) | YES
gb_code | varchar(64) | YES
lng | decimal(10,7) | YES
lat | decimal(10,7) | YES
status | tinyint(4) | NO
online | tinyint(4) | NO
signal_level | tinyint(4) | NO
signal_dbm | smallint(6) | YES
last_heartbeat | datetime | YES
last_data | longtext | YES
data_updated_at | datetime | YES
remark | varchar(500) | YES
created_at | datetime | YES
updated_at | datetime | YES

=== sim_card 表是否存在 ===
sim_card 表存在: yes

=== sim_card 表结构 ===
id | int(10) unsigned
device_id | int(10) unsigned
iccid | varchar(30)
phone | varchar(20)
operator | varchar(20)
quota_mb | bigint(20)
used_mb | bigint(20)
expire_date | date
last_sync | datetime
status | tinyint(4)
created_at | datetime