I want to use Python to get the RSSI value for Bluetooth.

I don't know how to use Raspberry Pi2 to get RSSI values for smartphone devices in Python. Could you tell me if there is a good way?

The code below uses Bluetooth to record the time a user enters or leaves the room.
I would like to add a conditional branching function to this code to the terminal with the highest RSSI value when multiple smartphone terminals are in Bluetooth coverage.

My environment is Python 2.7.9, PyBluez 0.2.2

import bluetooth
import time

print "In/Out Board"

while True:
    print "Checking" + time.strftime("%a,%d%b%Y%H:%M:%S", time.gmtime())

    result=bluetooth.lookup_name('00:00:00:00:00:00', timeout=5) 
    if(result!=None):
        print "John:in"
    else:
        print "John:out"

    result=bluetooth.lookup_name('00:00:00:00:00:00', timeout=5)
    if(result!=None):
        print "Paul:in"
    else:
        print "Paul:out"

    time.sleep(60)

python iphone bluetooth

2022-09-29 21:27

1 Answers

bluetooth.byte_to_signed_int()

It appears to be available in .

Why don't you refer to the code below here?

def device_quiry_with_with_rssi(sock):
    # save current filter
    old_filter=sock.getsockopt (bluez.SOL_HCI, bluez.HCI_FILTER, 14)

    # perform a device query on bluetooth device#0
    # The inquiry should last 8*1.28 = 10.24 seconds
    # before the query is performed, bluez should flush its cache of
    # previously discovered devices
    flt=bluez.hci_filter_new()
    bluez.hci_filter_all_events(flt)
    bluez.hci_filter_set_pttype(flt,bluez.HCI_EVENT_PKT)
    sock.setsockopt(bluez.SOL_HCI,bluez.HCI_FILTER,flt)

    duration = 4
    max_responses = 255
    cmd_pkt = structure.pack ("BBBBBB", 0x33, 0x8b, 0x9e, duration, max_responses)
    bluez.hci_send_cmd(sock,bluez.OGF_LINK_CTL,bluez.OCF_INQUIRY,cmd_pkt)

    results = [ ]

    done = False
    while not done:
        pkt = sock.recv(255)
        ptype, event, plen=structure.unpack("BBB", pkt[:3])
        if event==bluez.EVT_INQUIRY_RESULT_WITH_RSSI:
            pkt = pkt [3:]
            nrsp=bluetooth.get_byte (pkt[0])
            for i in range (nrsp):
                addr=bluez.ba2str(pkt[1+6*i:1+6*i+6])
                rssi=bluetooth.byte_to_signed_int(
                        bluetooth.get_byte(pkt[1+13*nrsp+i]))
                results.append(addr,rssi)
                print("[%s] RSSI: [%d]"%(addr,rssi))
        elifevent==bluez.EVT_INQUIRY_COMPLETE:
            done = True
        elifevent==bluez.EVT_CMD_STATUS:
            status, ncmd, opcode=struct.unpack("BBH", pkt [3:7])
            if status!=0:
                print("uhoh...")
                printpacket (pkt [3:7])
                done = True
        elifevent==bluez.EVT_INQUIRY_RESULT:
            pkt = pkt [3:]
            nrsp=bluetooth.get_byte (pkt[0])
            for i in range (nrsp):
                addr=bluez.ba2str(pkt[1+6*i:1+6*i+6])
                results.append(addr,-1)
                print("[%s](no RRSI)"%addr)
        else:
            print("unrecognized packet type 0x%02x"%ptype)
        print("event", event)


    # restore old filter
    sock.setsockopt (bluez.SOL_HCI, bluez.HCI_FILTER, old_filter)

    return results

2022-09-29 21:27

If you have any answers or tips

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