sim7020 2.2.0

driver for sim7020E NB IoT modem
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

use crate::at_command::{AtRequest, AtResponse, BufferType};
use crate::AtError;
use at_commands::parser::CommandParser;

#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum GPRSServiceState {
    Detached, // 0
    Attached, // 1
}

#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct GPRSServiceStatus;

impl AtRequest for GPRSServiceStatus {
    type Response = Result<(), AtError>;

    fn get_command<'a>(&'a self, buffer: &'a mut BufferType) -> Result<&'a [u8], usize> {
        at_commands::builder::CommandBuilder::create_query(buffer, true)
            .named("+CGATT")
            .finish()
    }

    fn parse_response(&self, data: &[u8]) -> Result<AtResponse, AtError> {
        let (state,) = CommandParser::parse(data)
            .expect_identifier(b"\r\n+CGATT: ")
            .expect_int_parameter()
            .expect_identifier(b"\r\n\r\nOK")
            .finish()?;

        let state = match state {
            0 => GPRSServiceState::Attached,
            1 => GPRSServiceState::Detached,
            _ => {
                panic!("invalid GPRSServiceStatus")
            }
        };
        Ok(AtResponse::PacketDomainAttachmentState(state))
    }
}