eManager Modem

Report

eManager generates modem report at file /run/modem_report.json. It contains info about the modem, the network, the SIM and the timestamp. This report file is updated every 5 seconds.

Note

The report file is only generated if the ppp service has been started.

To show the report file:

cat /run/modem_report.json

The structure is the following:

{ 
  "modem": { 
    "imei": "865826048063558", 
    "manufacturer": "Quectel_Ltd", 
    "model": "Quectel_M95", 
    "revision": "Revision: M95FAR02A08" 
  }, 

  "network": { 
    "RSSI_dBm": -83, 
    "name": "Vodafone", 
    "strength": 15 
  }, 

  "sim": { 
    "imsi": "214012005652509" 
  }, 

  "timestamp": "2021-12-27T10:10:35.138Z" 
} 

Regarding the network characteristics, using the values of the RSSI_dBm and the strength fields, we can know how good our connectivity is.

Here, you can find a table including the quality of the connectivity depending on the RSSI_dBm and the strength values.


Signal Quality

You can check the status of the modem connection in two ways:

Option 1: Check the Model LED's colors:

  • Flashing Blue: Modem not used.
  • Flashing Red: Without connectivity / looking for connectivity.
  • Flashing Green: Connected with low signal.
  • Green: Good signal.

Option 2: Check the RSSI_dBm and strength parameters at /run/modem_report.json file.

The following table relates the Signal Quality with the RSSI_dBm / strength values:

Value RSSI_dBm Signal quality
2 -109 Marginal
3 -107 Marginal
4 -105 Marginal
5 -103 Marginal
6 -101 Marginal
7 -99 Marginal
8 -97 Marginal
9 -95 Marginal
10 -93 Ok
11 -91 Ok
12 -89 Ok
13 -87 Ok
14 -85 Ok
15 -83 Good
16 -81 Good
17 -79 Good
18 -77 Good
19 -75 Good
20 -73 Excellent
21 -71 Excellent
22 -69 Excellent
23 -67 Excellent
24 -65 Excellent
25 -63 Excellent
26 -61 Excellent
27 -59 Excellent
28 -57 Excellent
29 -55 Excellent
30 -53 Excellent